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- W2187623732 abstract "Maternal effects have been reported using different animal models for post weaning growth traits in some cattle breeds. Variance components for additive direct, additive maternal, permanent environmental maternal effects, the covariance between additive direct and maternal effects were estimated by restricted maximum likelihood, fitting five animal models from 2978 of 18 months (18MW) weight pedigree records of indigenous Tuli cattle of Zimbabwe. All investigated models included a random direct genetic effect, but different combinations of random maternal genetic and permanent environmental effects as well as for direct- maternal genetic covariance. The direct heritability (h 2 a) were constant (0.10) when the maternal genetic effects were included in the model, while (h 2 a) estimates were higher (0.22) and (0.63) when maternal effects were excluded. The maternal heritability (h 2 m) was (0.23) and higher than the direct heritability (0.10) when only maternal genetic effects were included in the model and did not change even when the permanent environmental effects of the dam was added. The permanent environmental effects of the dam was negligible and a strong positive correlation between direct and maternal genetic effects (σ 2 am) was observed. The strong positive genetic correlation between direct and maternal genetic effects would not limit the effective utilization of both direct and maternal effects in selection for 18MW growth in indigenous Tuli cattle. A simple animal model with additive direct genetic effects as the only random effect would be appropriate for genetic evaluation of 18MW in indigenous Tuli cattle.." @default.
- W2187623732 created "2016-06-24" @default.
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- W2187623732 date "2012-01-01" @default.
- W2187623732 modified "2023-09-27" @default.
- W2187623732 title "Research article IMPACT OF MATERNAL EFFECTS ON RANKING OF ANIMAL MODELS IN GENETIC PARAMETER ESTIMATION FOR 18-MONTHS WEIGHT IN INDIGENOUS TULI CATTLE OF ZIMBABWE" @default.
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