Genetic parameters of test-day milk yield in Guzerá cattle under tropical conditions

The objective of this study was to estimate genetic parameters for test-day milk yield (TDMY) in Guzerá cows using random regression models. Additive and permanent environmental random effects were modeled by random regression on fourth- and fifth-order orthogonal Legendre polynomials, respectively....

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Veröffentlicht in:	Genetics and molecular research 2015-01, Vol.14 (4), p.13618-13624
Hauptverfasser:	Cruz, D A C, Peixoto, M G C D, Bruneli, F A T, Bignardi, A B, El Faro, L
Format:	Artikel
Sprache:	eng
Schlagworte:	Animals Cattle Genetic Association Studies Lactation Milk Quantitative Trait, Heritable Tropical Climate
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container_title	Genetics and molecular research
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creator	Cruz, D A C Peixoto, M G C D Bruneli, F A T Bignardi, A B El Faro, L
description	The objective of this study was to estimate genetic parameters for test-day milk yield (TDMY) in Guzerá cows using random regression models. Additive and permanent environmental random effects were modeled by random regression on fourth- and fifth-order orthogonal Legendre polynomials, respectively. The residual variances were heterogeneous, with seven classes. Heritability estimates for TDMY ranged from 0.24 to 0.52, with higher heritabilities for yields during early lactation. Genetic correlations between TDMYs ranged from -0.03 to 0.95. The phenotypic and permanent environmental correlations were all positive, and the highest estimates were between adjacent TDMYs. The results suggest that TDMYs obtained with random regression models may be used as selection criteria for Guzerá cattle.
doi_str_mv	10.4238/2015.October.28.23
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subjects	Animals Cattle Genetic Association Studies Lactation Milk Quantitative Trait, Heritable Tropical Climate
title	Genetic parameters of test-day milk yield in Guzerá cattle under tropical conditions
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