Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent
The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (R...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Schmitz, Walter [verfasserIn] Kramer, Michael [verfasserIn] Erhardt, Georg [verfasserIn] Gauly, Matthias [verfasserIn] Driancourt, Marc-Antoine [verfasserIn] Holtz, Wolfgang [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
Enthalten in: Livestock science - Amsterdam : Elsevier Science, 2006, 206 |
|---|---|
| Übergeordnetes Werk: |
volume:206 |
| DOI / URN: |
10.1016/j.livsci.2017.10.025 |
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| Katalog-ID: |
ELV041033876 |
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| 245 | 1 | 0 | |a Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent |
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| 520 | |a The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. | ||
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| 700 | 1 | |a Erhardt, Georg |e verfasserin |4 aut | |
| 700 | 1 | |a Gauly, Matthias |e verfasserin |4 aut | |
| 700 | 1 | |a Driancourt, Marc-Antoine |e verfasserin |4 aut | |
| 700 | 1 | |a Holtz, Wolfgang |e verfasserin |4 aut | |
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10.1016/j.livsci.2017.10.025 doi (DE-627)ELV041033876 (ELSEVIER)S1871-1413(17)30327-X DE-627 ger DE-627 rda eng 630 640 VZ Schmitz, Walter verfasserin aut Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. Beef cattle Cow Fixed-time AI Cosynch hCG Kramer, Michael verfasserin aut Erhardt, Georg verfasserin aut Gauly, Matthias verfasserin aut Driancourt, Marc-Antoine verfasserin aut Holtz, Wolfgang verfasserin aut Enthalten in Livestock science Amsterdam : Elsevier Science, 2006 206 Online-Ressource (DE-627)508973406 (DE-600)2226834-0 (DE-576)252454332 1871-1413 nnns volume:206 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2098 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 206 |
| spelling |
10.1016/j.livsci.2017.10.025 doi (DE-627)ELV041033876 (ELSEVIER)S1871-1413(17)30327-X DE-627 ger DE-627 rda eng 630 640 VZ Schmitz, Walter verfasserin aut Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. Beef cattle Cow Fixed-time AI Cosynch hCG Kramer, Michael verfasserin aut Erhardt, Georg verfasserin aut Gauly, Matthias verfasserin aut Driancourt, Marc-Antoine verfasserin aut Holtz, Wolfgang verfasserin aut Enthalten in Livestock science Amsterdam : Elsevier Science, 2006 206 Online-Ressource (DE-627)508973406 (DE-600)2226834-0 (DE-576)252454332 1871-1413 nnns volume:206 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2098 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 206 |
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10.1016/j.livsci.2017.10.025 doi (DE-627)ELV041033876 (ELSEVIER)S1871-1413(17)30327-X DE-627 ger DE-627 rda eng 630 640 VZ Schmitz, Walter verfasserin aut Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. Beef cattle Cow Fixed-time AI Cosynch hCG Kramer, Michael verfasserin aut Erhardt, Georg verfasserin aut Gauly, Matthias verfasserin aut Driancourt, Marc-Antoine verfasserin aut Holtz, Wolfgang verfasserin aut Enthalten in Livestock science Amsterdam : Elsevier Science, 2006 206 Online-Ressource (DE-627)508973406 (DE-600)2226834-0 (DE-576)252454332 1871-1413 nnns volume:206 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2098 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 206 |
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10.1016/j.livsci.2017.10.025 doi (DE-627)ELV041033876 (ELSEVIER)S1871-1413(17)30327-X DE-627 ger DE-627 rda eng 630 640 VZ Schmitz, Walter verfasserin aut Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. Beef cattle Cow Fixed-time AI Cosynch hCG Kramer, Michael verfasserin aut Erhardt, Georg verfasserin aut Gauly, Matthias verfasserin aut Driancourt, Marc-Antoine verfasserin aut Holtz, Wolfgang verfasserin aut Enthalten in Livestock science Amsterdam : Elsevier Science, 2006 206 Online-Ressource (DE-627)508973406 (DE-600)2226834-0 (DE-576)252454332 1871-1413 nnns volume:206 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2098 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 206 |
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10.1016/j.livsci.2017.10.025 doi (DE-627)ELV041033876 (ELSEVIER)S1871-1413(17)30327-X DE-627 ger DE-627 rda eng 630 640 VZ Schmitz, Walter verfasserin aut Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent 2017 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. Beef cattle Cow Fixed-time AI Cosynch hCG Kramer, Michael verfasserin aut Erhardt, Georg verfasserin aut Gauly, Matthias verfasserin aut Driancourt, Marc-Antoine verfasserin aut Holtz, Wolfgang verfasserin aut Enthalten in Livestock science Amsterdam : Elsevier Science, 2006 206 Online-Ressource (DE-627)508973406 (DE-600)2226834-0 (DE-576)252454332 1871-1413 nnns volume:206 GBV_USEFLAG_U GBV_ELV SYSFLAG_U GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_32 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_90 GBV_ILN_95 GBV_ILN_100 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_224 GBV_ILN_370 GBV_ILN_381 GBV_ILN_602 GBV_ILN_702 GBV_ILN_2001 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2006 GBV_ILN_2007 GBV_ILN_2008 GBV_ILN_2009 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2026 GBV_ILN_2027 GBV_ILN_2031 GBV_ILN_2034 GBV_ILN_2037 GBV_ILN_2038 GBV_ILN_2039 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2055 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2070 GBV_ILN_2086 GBV_ILN_2088 GBV_ILN_2098 GBV_ILN_2106 GBV_ILN_2108 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2116 GBV_ILN_2118 GBV_ILN_2119 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2144 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2188 GBV_ILN_2190 GBV_ILN_2232 GBV_ILN_2336 GBV_ILN_2470 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4046 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4326 GBV_ILN_4333 GBV_ILN_4334 GBV_ILN_4335 GBV_ILN_4338 GBV_ILN_4393 AR 206 |
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Schmitz, Walter @@aut@@ Kramer, Michael @@aut@@ Erhardt, Georg @@aut@@ Gauly, Matthias @@aut@@ Driancourt, Marc-Antoine @@aut@@ Holtz, Wolfgang @@aut@@ |
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In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. 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| author |
Schmitz, Walter |
| spellingShingle |
Schmitz, Walter ddc 630 misc Beef cattle misc Cow misc Fixed-time AI misc Cosynch misc hCG Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent |
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630 640 VZ Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent Beef cattle Cow Fixed-time AI Cosynch hCG |
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ddc 630 misc Beef cattle misc Cow misc Fixed-time AI misc Cosynch misc hCG |
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ddc 630 misc Beef cattle misc Cow misc Fixed-time AI misc Cosynch misc hCG |
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ddc 630 misc Beef cattle misc Cow misc Fixed-time AI misc Cosynch misc hCG |
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Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent |
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(DE-627)ELV041033876 (ELSEVIER)S1871-1413(17)30327-X |
| title_full |
Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent |
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Schmitz, Walter |
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Livestock science |
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2017 |
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Schmitz, Walter Kramer, Michael Erhardt, Georg Gauly, Matthias Driancourt, Marc-Antoine Holtz, Wolfgang |
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Elektronische Aufsätze |
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Schmitz, Walter |
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10.1016/j.livsci.2017.10.025 |
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630 640 |
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verfasserin |
| title_sort |
pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hcg as ovulation inducing agent |
| title_auth |
Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent |
| abstract |
The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. |
| abstractGer |
The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. |
| abstract_unstemmed |
The aim of this study was to document the effectiveness of the implementation of a cosynch protocol and fixed time artificial insemination in suckled beef cows kept under range conditions in Germany. In addition, the suitability of hCG administration as an alternative to the GnRH analog buserelin (Receptal®, Intervet, Germany) as ovulation inducing agent was investigated. The 120 Simmental and 120 German Angus cows were randomly divided into four groups. Cows of Group 1 were subjected to the classical cosynch protocol, constituting administration of GnRH, followed, 7 days later, by prostaglandin F2α and, after 2 days, another GnRH administration and simultaneous AI. In cows of Group 2, hCG was administered instead of GnRH at the beginning of the protocol, in Group 3 at the end and in Group 4 at the beginning and at the end. Inseminations with frozen-thawed semen from Limousin, Charolais, Simmental and German Angus sires were carried out by the same skilled inseminator. Blood samples collected 11 days before and on days 0, 7 and 9 of the cosynch protocol were analyzed for progesterone concentration. The study extended over three consecutive years. Of the total of 489 inseminations, 53% resulted in pregnancies (Simmental: 60%; German Angus: 48%). When GnRH was administered at the beginning and at the end of the cosynch protocol (Group 1), pregnancy rate across breeds was 65% (Simmental: 61%; German Angus: 68%); likewise when hCG was substituted for GnRH at the end of the protocol (Group 2). Pregnancy rate across breeds reached 48% when hCG was given at the beginning (Group 3) and was lowest (37%) when hCG was given at the beginning and at the end. German Angus cows responded particularly poorly to hCG treatment. In cows that were cycling, as indicated by serum progesterone levels 11 and 0 days before treatment, pregnancy rate across breeds and treatments was highest (57%) if the cosynch protocol was initiated at a stage of the cycle when peripheral progesterone levels were on the rise. In non-cycling cows, representing only 13% of the herd, contrary to expectation pregnancy rate reached 65%. In conclusion, implementation of fixed-time artificial insemination in suckled beef cows kept under local range conditions led to satisfactory pregnancy results, especially if the cosynch protocol was initiated at a stage when progesterone levels were on the rise. Substitution of hCG for GnRH proved to be of no advantage; in fact, when administered at the beginning of the protocol it resulted in a detrimental effect on fertility. |
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| title_short |
Pregnancy rate after fixed-time artificial insemination of suckled beef cows subjected to a cosynch protocol with either buserelin or hCG as ovulation inducing agent |
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Kramer, Michael Erhardt, Georg Gauly, Matthias Driancourt, Marc-Antoine Holtz, Wolfgang |
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Kramer, Michael Erhardt, Georg Gauly, Matthias Driancourt, Marc-Antoine Holtz, Wolfgang |
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| doi_str |
10.1016/j.livsci.2017.10.025 |
| up_date |
2024-07-06T19:03:11.397Z |
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