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|Title:||Random regression test day models to estimate genetic parameters for milk yield and milk components in Philippine dairy buffaloes||Contributor(s):||Flores, Ester Battad (author); Van Der Werf, Julius H (author)||Publication Date:||2015||DOI:||10.1111/jbg.12133||Handle Link:||https://hdl.handle.net/1959.11/19456||Abstract:||Heritabilities and genetic correlations for milk production traits were estimated from first-parity test day records on 1022 Philippine dairy buffalo cows. Traits analysed included milk (MY), fat (FY) and protein (PY) yields, and fat (Fat%) and protein (Prot%) concentrations. Varying orders of Legendre polynomials (Legm) as well as the Wilmink function (Wil) were used in random regression models. These various models were compared based on log likelihood, Akaike's information criterion, Bayesian information criterion and genetic variance estimates. Six residual variance classes were sufficient for MY, FY, PY and Fat%, while seven residual classes for Prot%. Multivariate analysis gave higher estimates of genetic variance and heritability compared with univariate analysis for all traits. Heritability estimates ranged from 0.25 to 0.44, 0.13 to 0.31 and 0.21 to 0.36 for MY, FY and PY, respectively. Wilmink's function was the better fitting function for additive genetic effects for all traits. It was also the preferred function for permanent environment effects for Fat% and Prot%, but for MY, FY and PY, the Legm was the appropriate function. Genetic correlations of MY with FY and PY were high and they were moderately negative with Fat% and Prot%. To prevent deterioration in Fat% and Prot% and improve milk quality, more weight should be applied to milk component traits.||Publication Type:||Journal Article||Source of Publication:||Journal of Animal Breeding and Genetics, 132(4), p. 289-300||Publisher:||Wiley-Blackwell Verlag GmbH||Place of Publication:||Germany||ISSN:||0931-2668
|Field of Research (FOR):||070201 Animal Breeding||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 31
|Appears in Collections:||Journal Article|
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