Genomic evaluation of resistance to
The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and impleme...
Ausführliche Beschreibung
Autor*in: |
Dlamini, N.M. [verfasserIn] Visser, C. [verfasserIn] Snyman, M.A. [verfasserIn] Soma, P. [verfasserIn] Muchadeyi, F.C. [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2019 |
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Schlagwörter: |
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Übergeordnetes Werk: |
Enthalten in: Small ruminant research - Amsterdam [u.a.] : Elsevier Science, 1988, 175, Seite 117-125 |
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Übergeordnetes Werk: |
volume:175 ; pages:117-125 |
DOI / URN: |
10.1016/j.smallrumres.2019.04.020 |
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Katalog-ID: |
ELV002353741 |
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520 | |a The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. | ||
650 | 4 | |a Body condition score | |
650 | 4 | |a Gastrointestinal nematodes | |
650 | 4 | |a Genomic | |
650 | 4 | |a Famacha | |
650 | 4 | |a Faecal egg count | |
700 | 1 | |a Visser, C. |e verfasserin |4 aut | |
700 | 1 | |a Snyman, M.A. |e verfasserin |4 aut | |
700 | 1 | |a Soma, P. |e verfasserin |4 aut | |
700 | 1 | |a Muchadeyi, F.C. |e verfasserin |4 aut | |
773 | 0 | 8 | |i Enthalten in |t Small ruminant research |d Amsterdam [u.a.] : Elsevier Science, 1988 |g 175, Seite 117-125 |h Online-Ressource |w (DE-627)306591537 |w (DE-600)1498734-X |w (DE-576)090954483 |x 0921-4488 |7 nnns |
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article:09214488:2019----::eoieautoor |
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2019 |
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2019 |
allfields |
10.1016/j.smallrumres.2019.04.020 doi (DE-627)ELV002353741 (ELSEVIER)S0921-4488(18)30517-0 DE-627 ger DE-627 rda eng 630 640 DE-600 Dlamini, N.M. verfasserin aut Genomic evaluation of resistance to 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. Body condition score Gastrointestinal nematodes Genomic Famacha Faecal egg count Visser, C. verfasserin aut Snyman, M.A. verfasserin aut Soma, P. verfasserin aut Muchadeyi, F.C. verfasserin aut Enthalten in Small ruminant research Amsterdam [u.a.] : Elsevier Science, 1988 175, Seite 117-125 Online-Ressource (DE-627)306591537 (DE-600)1498734-X (DE-576)090954483 0921-4488 nnns volume:175 pages:117-125 GBV_USEFLAG_U SYSFLAG_U GBV_ELV 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_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 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 175 117-125 |
spelling |
10.1016/j.smallrumres.2019.04.020 doi (DE-627)ELV002353741 (ELSEVIER)S0921-4488(18)30517-0 DE-627 ger DE-627 rda eng 630 640 DE-600 Dlamini, N.M. verfasserin aut Genomic evaluation of resistance to 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. Body condition score Gastrointestinal nematodes Genomic Famacha Faecal egg count Visser, C. verfasserin aut Snyman, M.A. verfasserin aut Soma, P. verfasserin aut Muchadeyi, F.C. verfasserin aut Enthalten in Small ruminant research Amsterdam [u.a.] : Elsevier Science, 1988 175, Seite 117-125 Online-Ressource (DE-627)306591537 (DE-600)1498734-X (DE-576)090954483 0921-4488 nnns volume:175 pages:117-125 GBV_USEFLAG_U SYSFLAG_U GBV_ELV 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_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 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 175 117-125 |
allfields_unstemmed |
10.1016/j.smallrumres.2019.04.020 doi (DE-627)ELV002353741 (ELSEVIER)S0921-4488(18)30517-0 DE-627 ger DE-627 rda eng 630 640 DE-600 Dlamini, N.M. verfasserin aut Genomic evaluation of resistance to 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. Body condition score Gastrointestinal nematodes Genomic Famacha Faecal egg count Visser, C. verfasserin aut Snyman, M.A. verfasserin aut Soma, P. verfasserin aut Muchadeyi, F.C. verfasserin aut Enthalten in Small ruminant research Amsterdam [u.a.] : Elsevier Science, 1988 175, Seite 117-125 Online-Ressource (DE-627)306591537 (DE-600)1498734-X (DE-576)090954483 0921-4488 nnns volume:175 pages:117-125 GBV_USEFLAG_U SYSFLAG_U GBV_ELV 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_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 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 175 117-125 |
allfieldsGer |
10.1016/j.smallrumres.2019.04.020 doi (DE-627)ELV002353741 (ELSEVIER)S0921-4488(18)30517-0 DE-627 ger DE-627 rda eng 630 640 DE-600 Dlamini, N.M. verfasserin aut Genomic evaluation of resistance to 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. Body condition score Gastrointestinal nematodes Genomic Famacha Faecal egg count Visser, C. verfasserin aut Snyman, M.A. verfasserin aut Soma, P. verfasserin aut Muchadeyi, F.C. verfasserin aut Enthalten in Small ruminant research Amsterdam [u.a.] : Elsevier Science, 1988 175, Seite 117-125 Online-Ressource (DE-627)306591537 (DE-600)1498734-X (DE-576)090954483 0921-4488 nnns volume:175 pages:117-125 GBV_USEFLAG_U SYSFLAG_U GBV_ELV 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_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 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 175 117-125 |
allfieldsSound |
10.1016/j.smallrumres.2019.04.020 doi (DE-627)ELV002353741 (ELSEVIER)S0921-4488(18)30517-0 DE-627 ger DE-627 rda eng 630 640 DE-600 Dlamini, N.M. verfasserin aut Genomic evaluation of resistance to 2019 nicht spezifiziert zzz rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. Body condition score Gastrointestinal nematodes Genomic Famacha Faecal egg count Visser, C. verfasserin aut Snyman, M.A. verfasserin aut Soma, P. verfasserin aut Muchadeyi, F.C. verfasserin aut Enthalten in Small ruminant research Amsterdam [u.a.] : Elsevier Science, 1988 175, Seite 117-125 Online-Ressource (DE-627)306591537 (DE-600)1498734-X (DE-576)090954483 0921-4488 nnns volume:175 pages:117-125 GBV_USEFLAG_U SYSFLAG_U GBV_ELV 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_602 GBV_ILN_702 GBV_ILN_2003 GBV_ILN_2004 GBV_ILN_2005 GBV_ILN_2011 GBV_ILN_2014 GBV_ILN_2015 GBV_ILN_2020 GBV_ILN_2021 GBV_ILN_2025 GBV_ILN_2027 GBV_ILN_2034 GBV_ILN_2038 GBV_ILN_2044 GBV_ILN_2048 GBV_ILN_2049 GBV_ILN_2050 GBV_ILN_2056 GBV_ILN_2059 GBV_ILN_2061 GBV_ILN_2064 GBV_ILN_2065 GBV_ILN_2068 GBV_ILN_2111 GBV_ILN_2112 GBV_ILN_2113 GBV_ILN_2118 GBV_ILN_2122 GBV_ILN_2129 GBV_ILN_2143 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_2152 GBV_ILN_2153 GBV_ILN_2190 GBV_ILN_2336 GBV_ILN_2507 GBV_ILN_2522 GBV_ILN_4035 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4242 GBV_ILN_4251 GBV_ILN_4305 GBV_ILN_4313 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 175 117-125 |
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abstract |
The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. |
abstractGer |
The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. |
abstract_unstemmed |
The aim of this study was to use genome-wide SNP data to investigate phenotypic and genetic differences in resistance to Haemonchus contortus between resistant and susceptible South African Dohne Merino sheep. The participating farm (Wauldby) has a history of heavy H. contortus challenge and implemented a selection strategy for resistance to H. contortus in 2011. Faecal egg count (FEC), body condition scores (BCS) and Famacha© scores (FAM) were recorded annually on lambs from weaning in January until the end of June from 2011 to 2014. Animals with FAM scores of ≥ 2.5 or BCS scores < 1.5 were subjected to anthelmintic treatment and recorded as “Dosed” animals. Animals (196) were selected for genotyping based on EBV for FEC and classified into Case and Control groups on the basis of whether they were dosed or not. The Grootfontein Dohne Merino flock has never been subjected to selection for resistance to gastrointestinal parasites and 48 animals were selected on FEC for genotyping. DNA obtained from blood samples were genotyped using the Illumina® Ovine SNP50 BeadChip. Principal component analysis (PCA) resulted in four distinct genetic clusters, with the Grootfontein sheep population clustering separately. The Wauldby animals in Cluster 3 had significantly lower FEC and higher BCS than the animals in Clusters 2 and 4. FEC breeding values of 114 ± 97, -629 ± 84 and -2 ± 45 were recorded for PCA-based Genetic cluster 2, 3 and 4 animals, respectively. The majority (88%) of animals in Cluster 3 were the progeny of sires from the resistant line. The average number of runs of homozygosity (ROH) was 44, 46, 54 and 47 per animal for Clusters 1, 2, 3 and 4 respectively. The highest number of ROHs was found on chromosomes 1, 2, 3, 4, 6, 9 and 10, on which QTL for resistance traits have been identified previously. Sires in Genetic cluster 3 were highly resistant and can be used in a breeding program to develop H. contortus resistant sheep. The results indicated genetic variation in host resistance against H. contortus in the Wauldby flock and breeding for resistance against nematodes is feasible. |
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|
score |
7.4000654 |