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Heterogeneity of Variance by Sex in Postweaning Gain of Angus Calves under Different Environment Levels |
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T. Oikawa, K. Hammond, B. Tier |
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| Abstract |
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Angus postweaning daily gain (PWDG) were analyzed to investigate heterogeneous variance by sex. A set of data (16,239 records) was divided into six sub-data sets according to level of environment. REML estimation was conducted by a multitrait model, where PWDG in each sex was treated as a separate trait. Estimates showed diversity among environmental levels, where the heritability for heifers was high in good environment but low in poor environment. The bull`s estimates varied among environmental levels. The largest heterogeneity of phenotypic variance between sexes was estimated in a data set of the poor environment level. The genetic correlations between the heifer`s PWDG and the bull`s PWDG were high in the good environment and low in the poor environment (-0.17). The results suggest existence of genotype by sex interaction in the poor environment. |
| Keywords:
Genotype-Environment Interaction; Variance Components; Growth; Beef Cattle; Sex |
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