You are in the accessibility menu

Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorVenturini, G. C.-
dc.contributor.authorSavegnago, R. P.-
dc.contributor.authorNunes, B. N.-
dc.contributor.authorLedur, M. C.-
dc.contributor.authorSchmidt, G. S.-
dc.contributor.authorEl Faro, L.-
dc.contributor.authorMunari, D. P.-
dc.identifier.citationPoultry Science, v. 92, n. 9, p. 2283-2289, 2013.-
dc.description.abstractThe objectives of this study were to estimate genetic parameters for accumulated egg production over 3-wk periods and for total egg production over 54 wk of egg-laying, and using principal component analysis (PCA), to explore the relationships among the breeding values of these traits to identify the possible genetic relationships present among them and hence to observe which of them could be used as selection criteria for improving egg production. Egg production was measured among 1,512 females of a line of White Leghorn laying hens. The traits analyzed were the number of eggs produced over partial periods of 3 wk, thus totaling 18 partial periods (P1 to P18), and the total number of eggs produced over the period between the 17 and 70 wk of age (PTOT), thus totaling 54 wk of egg production. Estimates of genetic parameters were obtained by means of the restricted maximum likelihood method, using 2-trait animal models. The PCA was done using the breeding values of partial and total egg production. The heritability estimates ranged from 0.05 ± 0.03 (P1 and P8) to 0.27 ± 0.06 (P4) in the 2-trait analysis. The genetic correlations between PTOT and partial periods ranged from 0.19 ± 0.31 (P1) to 1.00 ± 0.05 (P10, P11, and P12). Despite the high genetic correlation, selection of birds based on P10, P11, and P12 did not result in an increase in PTOT because of the low heritability estimates for these periods (0.06 ± 0.03, 0.12 ± 0.04, and 0.10 ± 0.04, respectively). The PCA showed that egg production can be divided genetically into 4 periods, and that P1 and P2 are independent and have little genetic association with the other periods. © 2013 Poultry Science Association Inc.en
dc.description.sponsorshipBrazilian Agricultural Research Corporation (Embrapa; Empresa Brasileira de Pesquisa Agropecuaria)-
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.description.sponsorshipPostgraduate Program on Genetics and Animal Breeding, Faculdade de Ciências Agrarias e Veterinarias, Universidade Estadual Paulista-
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.subjectBreeding value-
dc.subjectGenetic correlation-
dc.subjectMultivariate analysis-
dc.titleGenetic parameters and principal component analysis for egg production from White Leghorn hensen
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)-
dc.contributor.institutionSecretaria de Agricultura e Abastecimento (SAA)-
dc.description.affiliationDepartamento de Ciências Exatas Universidade Estadual Paulista (UNESP), Jaboticabal, São Paulo, 14884-900-
dc.description.affiliationEmbrapa Suínos e Aves, Concórdia, Santa Catarina, 89700-000-
dc.description.affiliationAgência Paulista de Tecnologia dos Agronegócios (APTA) Centro Leste Secretaria de Agricultura e Abastecimento (SAA), Ribeirão Preto, São Paulo, 14001-970-
dc.description.affiliationUnespDepartamento de Ciências Exatas Universidade Estadual Paulista (UNESP), Jaboticabal, São Paulo, 14884-900-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofPoultry Science-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

There are no files associated with this item.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.