Fitting Different Random Effects in Genetic Parameter Estimation Using Animal Models for Weaning Weight in Indigenous Tuli Cattle of Zimbabwe
Journal Title: Journal of Animal Science Advances - Year 2011, Vol 1, Issue 2
Abstract
Five models were fitted to weaning weight data of indigenous Tuli cattle to investigate their suitability for evaluation of breeding values. Variance components for direct, maternal, permanent environmental effects, covariance between direct and maternal effects were estimated by restricted maximum likelihood, fitting five different animal models from 4091 pedigree weaning weight records. All investigated models included a random direct effect, but different combinations of random maternal genetic and permanent environmental maternal effects as well as for direct- maternal genetic covariance. The direct heritability ranged from zero to 0.30 when maternal genetic effects were included in model, while direct heritability estimates were 0.21 and 0.68 when maternal effects were excluded. The maternal heritability was higher, 0.26 than direct heritability, zero when only maternal genetic effects were included in the model and were 0.19 and 0.30 when permanent environment maternal effects of the dam was added. The permanent environmental maternal effects were negligible and a small and positive genetic correlation was observed. The proportion of direct additive variance for weaning weight in indigenous Tuli was high which means genetic response might also be high. On the basis of the log likelihood ratio test results and number of parameters used, Model 5 was determined as the most appropriate model for weaning weight of indigenous Tuli cattle of Zimbabwe.
Authors and Affiliations
N. Assan
Keywords
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