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Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus

The litter size in Suffolk and Texel-sheep was analysed using REML and Bayesian methods. Litters born after hormonal induced oestrus and after natural oestrus were treated as different traits in order to estimate the genetic correlation between the traits. Explanatory variables were the age of the e...

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Autores principales: Janssens, Steven, Vandepitte, Walter, Bodin, Loys
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2004
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2697192/
https://www.ncbi.nlm.nih.gov/pubmed/15339632
http://dx.doi.org/10.1186/1297-9686-36-5-543
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author Janssens, Steven
Vandepitte, Walter
Bodin, Loys
author_facet Janssens, Steven
Vandepitte, Walter
Bodin, Loys
author_sort Janssens, Steven
collection PubMed
description The litter size in Suffolk and Texel-sheep was analysed using REML and Bayesian methods. Litters born after hormonal induced oestrus and after natural oestrus were treated as different traits in order to estimate the genetic correlation between the traits. Explanatory variables were the age of the ewe at lambing, period of lambing, a year*flock-effect, a permanent environmental effect associated with the ewe, and the additive genetic effect. The heritability estimates for litter size ranged from 0.06 to 0.13 using REML in bi-variate linear models. Transformation of the estimates to the underlying scale resulted in heritability estimates from 0.12 to 0.17. Posterior means of the heritability of litter size in the Bayesian approach with bi-variate threshold models varied from 0.05 to 0.18. REML estimates of the genetic correlations between the two types of litter size ranged from 0.57 to 0.64 in the Suffolk and from 0.75 to 0.81 in the Texel. The posterior means of the genetic correlation (Bayesian analysis) were 0.40 and 0.44 for the Suffolk and 0.56 and 0.75 for the Texel in the sire and animal model respectively. A bivariate threshold model seems appropriate for the genetic evaluation of prolificacy in the breeds concerned.
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spelling pubmed-26971922009-06-16 Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus Janssens, Steven Vandepitte, Walter Bodin, Loys Genet Sel Evol Research The litter size in Suffolk and Texel-sheep was analysed using REML and Bayesian methods. Litters born after hormonal induced oestrus and after natural oestrus were treated as different traits in order to estimate the genetic correlation between the traits. Explanatory variables were the age of the ewe at lambing, period of lambing, a year*flock-effect, a permanent environmental effect associated with the ewe, and the additive genetic effect. The heritability estimates for litter size ranged from 0.06 to 0.13 using REML in bi-variate linear models. Transformation of the estimates to the underlying scale resulted in heritability estimates from 0.12 to 0.17. Posterior means of the heritability of litter size in the Bayesian approach with bi-variate threshold models varied from 0.05 to 0.18. REML estimates of the genetic correlations between the two types of litter size ranged from 0.57 to 0.64 in the Suffolk and from 0.75 to 0.81 in the Texel. The posterior means of the genetic correlation (Bayesian analysis) were 0.40 and 0.44 for the Suffolk and 0.56 and 0.75 for the Texel in the sire and animal model respectively. A bivariate threshold model seems appropriate for the genetic evaluation of prolificacy in the breeds concerned. BioMed Central 2004-09-15 /pmc/articles/PMC2697192/ /pubmed/15339632 http://dx.doi.org/10.1186/1297-9686-36-5-543 Text en Copyright © 2004 INRA, EDP Sciences
spellingShingle Research
Janssens, Steven
Vandepitte, Walter
Bodin, Loys
Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
title Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
title_full Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
title_fullStr Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
title_full_unstemmed Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
title_short Genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
title_sort genetic parameters for litter size in sheep: natural versus hormone-induced oestrus
topic Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2697192/
https://www.ncbi.nlm.nih.gov/pubmed/15339632
http://dx.doi.org/10.1186/1297-9686-36-5-543
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