The maximum likelihood (ML) procedure outlined in Wewala, Anderson and Rae (1985) was used to estimate variance components for direct and maternal effects of weaning weights of Romney lambs. In addition, weaning weight adjustment factors were obtained. Large-sample variances for the estimates of the variance components and the estimable functions of the fixed effects in the model were also obtained. The heritability estimate of the direct effects is 0.20. The estimated genetic correlation between the direct and maternal effects of weaning weights is -0.51.

G. S Wewala, R. D Anderson, A. L Rae

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 312–317, 1986
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