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Estimates of genetic parameters for monthly egg production traits in a commercial broiler female line

In this study, genetic parameters for monthly records of egg production, collected from weeks 24 to 55 on 16,830 hens during nine generations from a pedigreed commercial broiler female line, were estimated with single-trait, multiple-trait and repeated records animal models, using restricted maximum... Full description

Journal Title: Italian Journal of Animal Science 01 January 2011, Vol.10(1), pp.e12-e12
Main Author: Abbas Gerami
Other Authors: Naser E.J. Kashan , Rasoul Vaez Torshizi , Neda Farzin
Format: Electronic Article Electronic Article
Language: English
Subjects:
Quelle: Directory of Open Access Journals (DOAJ)
ID: ISSN: 1594-4077 ; E-ISSN: 1828-051X ; DOI: 10.4081/ijas.2011.e12
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recordid: doaj_soai_doaj_org_article_1d9052dc512d4c2ebeec1a903fb28779
title: Estimates of genetic parameters for monthly egg production traits in a commercial broiler female line
format: Article
creator:
  • Abbas Gerami
  • Naser E.J. Kashan
  • Rasoul Vaez Torshizi
  • Neda Farzin
subjects:
  • Genetic Parameters
  • Monthly Egg Production
  • Age At Sexual Maturity, Broiler Line
  • Agriculture
ispartof: Italian Journal of Animal Science, 01 January 2011, Vol.10(1), pp.e12-e12
description: In this study, genetic parameters for monthly records of egg production, collected from weeks 24 to 55 on 16,830 hens during nine generations from a pedigreed commercial broiler female line, were estimated with single-trait, multiple-trait and repeated records animal models, using restricted maximum likelihood procedures. With and without age at sexual maturity as a covariate, two models were fitted to the data for each analysis. From the weekly productions, eight monthly records on a 28-day basis were created. The estimate of heritability from single-trait analysis for the first month's record was relatively high (0.428), decreased to 0.150 and 0.092 in the second and third months, respectively, and then, with minor fluctuations, remained constant. Age at sexual maturity had a substantial influence only on heritability of the first month (0.192) and, to some extent, of the second month (0.103). Estimates of heritability and repeatability decreased from 0.067 and 0.379 to 0.029 and 0.251, respectively, owing to age at sexual maturity. Genetic correlations were generally positive, being relatively high to very high between adjacent monthly records, ranging from 0.725 (between the first and second month) to 0.986 (between the fourth and fifth month). These estimates between monthly records decreased as the time interval of the ages increased. The effect of age at sexual maturity on reduction of heritability of the first month's record and of its genetic correlations with all other monthly records suggests that it is essentially necessary to be included in the model or that the analysis is carried out without the first month's record.
language: eng
source: Directory of Open Access Journals (DOAJ)
identifier: ISSN: 1594-4077 ; E-ISSN: 1828-051X ; DOI: 10.4081/ijas.2011.e12
fulltext: fulltext_linktorsrc
issn:
  • 1594-4077
  • 15944077
  • 1828-051X
  • 1828051X
url: Link


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titleEstimates of genetic parameters for monthly egg production traits in a commercial broiler female line
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subjectGenetic Parameters ; Monthly Egg Production ; Age At Sexual Maturity, Broiler Line ; Agriculture
descriptionIn this study, genetic parameters for monthly records of egg production, collected from weeks 24 to 55 on 16,830 hens during nine generations from a pedigreed commercial broiler female line, were estimated with single-trait, multiple-trait and repeated records animal models, using restricted maximum likelihood procedures. With and without age at sexual maturity as a covariate, two models were fitted to the data for each analysis. From the weekly productions, eight monthly records on a 28-day basis were created. The estimate of heritability from single-trait analysis for the first month's record was relatively high (0.428), decreased to 0.150 and 0.092 in the second and third months, respectively, and then, with minor fluctuations, remained constant. Age at sexual maturity had a substantial influence only on heritability of the first month (0.192) and, to some extent, of the second month (0.103). Estimates of heritability and repeatability decreased from 0.067 and 0.379 to 0.029 and 0.251, respectively, owing to age at sexual maturity. Genetic correlations were generally positive, being relatively high to very high between adjacent monthly records, ranging from 0.725 (between the first and second month) to 0.986 (between the fourth and fifth month). These estimates between monthly records decreased as the time interval of the ages increased. The effect of age at sexual maturity on reduction of heritability of the first month's record and of its genetic correlations with all other monthly records suggests that it is essentially necessary to be included in the model or that the analysis is carried out without the first month's record.
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In this study, genetic parameters for monthly records of egg production, collected from weeks 24 to 55 on 16,830 hens during nine generations from a pedigreed commercial broiler female line, were estimated with single-trait, multiple-trait and repeated records animal models, using restricted maximum likelihood procedures. With and without age at sexual maturity as a covariate, two models were fitted to the data for each analysis. From the weekly productions, eight monthly records on a 28-day basis were created. The estimate of heritability from single-trait analysis for the first month's record was relatively high (0.428), decreased to 0.150 and 0.092 in the second and third months, respectively, and then, with minor fluctuations, remained constant. Age at sexual maturity had a substantial influence only on heritability of the first month (0.192) and, to some extent, of the second month (0.103). Estimates of heritability and repeatability decreased from 0.067 and 0.379 to 0.029 and 0.251, respectively, owing to age at sexual maturity. Genetic correlations were generally positive, being relatively high to very high between adjacent monthly records, ranging from 0.725 (between the first and second month) to 0.986 (between the fourth and fifth month). These estimates between monthly records decreased as the time interval of the ages increased. The effect of age at sexual maturity on reduction of heritability of the first month's record and of its genetic correlations with all other monthly records suggests that it is essentially necessary to be included in the model or that the analysis is carried out without the first month's record.

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In this study, genetic parameters for monthly records of egg production, collected from weeks 24 to 55 on 16,830 hens during nine generations from a pedigreed commercial broiler female line, were estimated with single-trait, multiple-trait and repeated records animal models, using restricted maximum likelihood procedures. With and without age at sexual maturity as a covariate, two models were fitted to the data for each analysis. From the weekly productions, eight monthly records on a 28-day basis were created. The estimate of heritability from single-trait analysis for the first month's record was relatively high (0.428), decreased to 0.150 and 0.092 in the second and third months, respectively, and then, with minor fluctuations, remained constant. Age at sexual maturity had a substantial influence only on heritability of the first month (0.192) and, to some extent, of the second month (0.103). Estimates of heritability and repeatability decreased from 0.067 and 0.379 to 0.029 and 0.251, respectively, owing to age at sexual maturity. Genetic correlations were generally positive, being relatively high to very high between adjacent monthly records, ranging from 0.725 (between the first and second month) to 0.986 (between the fourth and fifth month). These estimates between monthly records decreased as the time interval of the ages increased. The effect of age at sexual maturity on reduction of heritability of the first month's record and of its genetic correlations with all other monthly records suggests that it is essentially necessary to be included in the model or that the analysis is carried out without the first month's record.

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