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dc.contributor.authorSANTOS, E. P. B.
dc.contributor.authorFELTES, G. L.
dc.contributor.authorNEGRI, R.
dc.contributor.authorCOBUCI, J. A.
dc.contributor.authorSILVA, M. V. G. B.
dc.identifier.citationArquivo Brasileiro de Medicina Veterinária e Zootecnia, v. 73, n. 1, p. 18-24, 2021.
dc.descriptionThe objective of this study was to estimate the components of variance and genetic parameters of test-day milk yield in first lactation Girolando cows, using a random regression model. A total of 126,892 test-day milk yield (TDMY) records of 15,351 first-parity Holstein, Gyr, and Girolando breed cows were used, obtained from the Associação Brasileira dos Criadores de Girolando. To estimate the components of (co) variance, the additive genetic functions and permanent environmental covariance were estimated by random regression in three functions: Wilmink, Legendre Polynomials (third order) and Linear spline Polynomials (three knots). The Legendre polynomial function showed better fit quality. The genetic and permanent environment variances for TDMY ranged from 2.67 to 5.14 and from 9.31 to 12.04, respectively. Heritability estimates gradually increased from the beginning (0.13) to mid-lactation (0.19). The genetic correlations between the days of the control ranged from 0.37 to 1.00. The correlations of permanent environment followed the same trend as genetic correlations. The use of Legendre polynomials via random regression model can be considered as a good tool for estimating genetic parameters for test-day milk yield records.
dc.subjectCorrelação genética
dc.subjectFunção de Wilmink
dc.subjectPolinômios de Legendre
dc.subjectPolinômios splines lineares
dc.titleEstimation of genetic parameters for test-day milk yield in Girolando cows using a random regression model.
dc.typeArtigo de periódico
dc.subject.thesagroGado Leiteiro
dc.subject.thesagroVariação Genética
dc.subject.thesagroParâmetro Genético
dc.contributor.institutionPós-graduando, Universidade Estadual de Santa Cruz; Pós-graduando, Universidade Federal do Rio Grande do Sul; Universidade Federal do Rio Grande do Sul; Universidade Federal do Rio Grande do Sul; MARCOS VINICIUS GUALBERTO B SILVA, CNPGL.
Appears in Collections:Artigo em periódico indexado (CNPGL)

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