Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep

Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a p...
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Autor*in:	Avdi, Melpomeni [verfasserIn] Banos, Georgios Kouttos, Athanasios Bodin, Loys Chemineau, Philippe

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2003

Schlagwörter:	reproduction genetic parameter sheep ovulatory activity

Anmerkung:	© INRA, EDP Sciences 2003

Übergeordnetes Werk:	Enthalten in: Genetics, selection, evolution - London : BioMed Central, 1989, 35(2003), 1 vom: 15. Jan.
Übergeordnetes Werk:	volume:35 ; year:2003 ; number:1 ; day:15 ; month:01

Links:	Volltext

DOI / URN:	10.1186/1297-9686-35-1-65

Katalog-ID:	SPR026802023

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520			\|a Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed.
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spelling	10.1186/1297-9686-35-1-65 doi (DE-627)SPR026802023 (SPR)1297-9686-35-1-65-e DE-627 ger DE-627 rakwb eng Avdi, Melpomeni verfasserin aut Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep 2003 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © INRA, EDP Sciences 2003 Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. reproduction (dpeaa)DE-He213 genetic parameter (dpeaa)DE-He213 sheep (dpeaa)DE-He213 ovulatory activity (dpeaa)DE-He213 Banos, Georgios aut Kouttos, Athanasios aut Bodin, Loys aut Chemineau, Philippe aut Enthalten in Genetics, selection, evolution London : BioMed Central, 1989 35(2003), 1 vom: 15. Jan. (DE-627)312849052 (DE-600)2012369-3 1297-9686 nnns volume:35 year:2003 number:1 day:15 month:01 https://dx.doi.org/10.1186/1297-9686-35-1-65 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 35 2003 1 15 01
allfields_unstemmed	10.1186/1297-9686-35-1-65 doi (DE-627)SPR026802023 (SPR)1297-9686-35-1-65-e DE-627 ger DE-627 rakwb eng Avdi, Melpomeni verfasserin aut Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep 2003 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © INRA, EDP Sciences 2003 Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. reproduction (dpeaa)DE-He213 genetic parameter (dpeaa)DE-He213 sheep (dpeaa)DE-He213 ovulatory activity (dpeaa)DE-He213 Banos, Georgios aut Kouttos, Athanasios aut Bodin, Loys aut Chemineau, Philippe aut Enthalten in Genetics, selection, evolution London : BioMed Central, 1989 35(2003), 1 vom: 15. Jan. (DE-627)312849052 (DE-600)2012369-3 1297-9686 nnns volume:35 year:2003 number:1 day:15 month:01 https://dx.doi.org/10.1186/1297-9686-35-1-65 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 35 2003 1 15 01
allfieldsGer	10.1186/1297-9686-35-1-65 doi (DE-627)SPR026802023 (SPR)1297-9686-35-1-65-e DE-627 ger DE-627 rakwb eng Avdi, Melpomeni verfasserin aut Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep 2003 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © INRA, EDP Sciences 2003 Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. reproduction (dpeaa)DE-He213 genetic parameter (dpeaa)DE-He213 sheep (dpeaa)DE-He213 ovulatory activity (dpeaa)DE-He213 Banos, Georgios aut Kouttos, Athanasios aut Bodin, Loys aut Chemineau, Philippe aut Enthalten in Genetics, selection, evolution London : BioMed Central, 1989 35(2003), 1 vom: 15. Jan. (DE-627)312849052 (DE-600)2012369-3 1297-9686 nnns volume:35 year:2003 number:1 day:15 month:01 https://dx.doi.org/10.1186/1297-9686-35-1-65 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 35 2003 1 15 01
allfieldsSound	10.1186/1297-9686-35-1-65 doi (DE-627)SPR026802023 (SPR)1297-9686-35-1-65-e DE-627 ger DE-627 rakwb eng Avdi, Melpomeni verfasserin aut Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep 2003 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier © INRA, EDP Sciences 2003 Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. reproduction (dpeaa)DE-He213 genetic parameter (dpeaa)DE-He213 sheep (dpeaa)DE-He213 ovulatory activity (dpeaa)DE-He213 Banos, Georgios aut Kouttos, Athanasios aut Bodin, Loys aut Chemineau, Philippe aut Enthalten in Genetics, selection, evolution London : BioMed Central, 1989 35(2003), 1 vom: 15. Jan. (DE-627)312849052 (DE-600)2012369-3 1297-9686 nnns volume:35 year:2003 number:1 day:15 month:01 https://dx.doi.org/10.1186/1297-9686-35-1-65 kostenfrei Volltext GBV_USEFLAG_A SYSFLAG_A GBV_SPRINGER SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_31 GBV_ILN_39 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_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 35 2003 1 15 01
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source	Enthalten in Genetics, selection, evolution 35(2003), 1 vom: 15. Jan. volume:35 year:2003 number:1 day:15 month:01
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author	Avdi, Melpomeni
spellingShingle	Avdi, Melpomeni misc reproduction misc genetic parameter misc sheep misc ovulatory activity Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep
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topic_title	Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep reproduction (dpeaa)DE-He213 genetic parameter (dpeaa)DE-He213 sheep (dpeaa)DE-He213 ovulatory activity (dpeaa)DE-He213
topic	misc reproduction misc genetic parameter misc sheep misc ovulatory activity
topic_unstemmed	misc reproduction misc genetic parameter misc sheep misc ovulatory activity
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title	Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep
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title_full	Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep
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author_browse	Avdi, Melpomeni Banos, Georgios Kouttos, Athanasios Bodin, Loys Chemineau, Philippe
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title_sort	sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the chios sheep
title_auth	Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep
abstract	Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. © INRA, EDP Sciences 2003
abstractGer	Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. © INRA, EDP Sciences 2003
abstract_unstemmed	Abstract Organising the breeding plan of a seasonally breeding species, such as sheep, presents a challenge to farmers and the industry as a whole, since both economical and biological considerations need to be carefully balanced. Understanding the breeding activity of individual animals becomes a prerequisite for a successful breeding program. This study set out to investigate the sources of variation and the genetic profile of the spontaneous, out-of-season ovulatory activity of ewes of the Chios dairy sheep breed in Greece. The definition of the trait was based on blood progesterone levels, measured before exposing the ewes to rams, which marks the onset of the usual breeding season. Data were 707 records, taken over two consecutive years, of 435 ewes kept at the Agricultural Research Station of Chalkidiki in northern Greece. When all available pedigree was included, the total number of animals involved was 1068. On average, 29% of all ewes exhibited spontaneous, out-of-season ovulatory activity, with no substantial variation between the years. Significant sources of systematic variation were the ewe age and live weight, and the month of previous lambing. Older, heavier ewes, that had lambed early the previous autumn, exhibited more frequent activity. Heritability estimates were 0.216 (± 0.084) with a linear and 0.291 with a threshold model. The latter better accounts for the categorical nature of the trait. The linear model repeatability was 0.230 (± 0.095). The results obtained in this study support the notion that spontaneous out-of-season ovulatory activity can be considered in the development of a breeding plan for the Chios sheep breed. © INRA, EDP Sciences 2003
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title_short	Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep
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author2	Banos, Georgios Kouttos, Athanasios Bodin, Loys Chemineau, Philippe
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Sources of variation and genetic profile of spontaneous, out-of-season ovulatory activity in the Chios sheep

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