Genetic parameters of test-day milk yield in Guzerá cattle under tropical conditions
| Autor: | El Faro L, F. A. T. Bruneli, Maria Gabriela Campolina Diniz Peixoto, Diego Augusto Campos da Cruz, Annaiza Braga Bignardi |
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| Rok vydání: | 2015 |
| Předmět: |
Tropical Climate
General Medicine Heritability Biology Residual Random effects model Milk Quantitative Trait Heritable Milk yield Test day Agronomy Random regression Statistics Genetics Animals Lactation Cattle Guzera cattle Molecular Biology Genetic Association Studies Selection (genetic algorithm) |
| Zdroj: | Genetics and Molecular Research. 14:13618-13624 |
| ISSN: | 1676-5680 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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