Random regression test day models to estimate genetic parameters for milk yield and milk components in Philippine dairy buffaloes

Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie
E B Flores, J H van der Werf

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 (Leg(m)) 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 wit...Continue Reading

References

Nov 1, 1996·Journal of Dairy Science·L R Schaeffer, J Jamrozik
Jun 1, 1997·Journal of Dairy Science·J JamrozikJ C Dekkers
May 23, 2000·Journal of Dairy Science·L R SchaefferB J Van Doormaal
Aug 12, 2005·Genetics, Selection, Evolution : GSE·Karin Meyer
Sep 14, 2010·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·R C SesanaH Tonhati
Mar 27, 2012·The Journal of Dairy Research·Rúsbel R Aspilcueta-BorquisHumberto Tonhati

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Citations

Apr 14, 2007·Journal of Dairy Science·P M VanRadenJ H Megonigal
Sep 24, 2013·Journal of Dairy Science·R P SavegnagoD P Munari
Mar 18, 2017·Ecology and Evolution·Marion VittecoqFrançois Renaud

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