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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Bibliographic Details
Published in:Genetics and molecular research 2015-01, Vol.14 (4), p.13618-13624
Main Authors: Cruz, D A C, Peixoto, M G C D, Bruneli, F A T, Bignardi, A B, El Faro, L
Format: Article
Language:English
Subjects:
Animals
Cattle
Genetic Association Studies
Lactation
Milk
Quantitative Trait, Heritable
Tropical Climate
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Summary: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.
ISSN:1676-5680
1676-5680
DOI:10.4238/2015.October.28.23