Problems in estimating maternal effects
1980
Willham, R.L. (Iowa State Univ., Ames (USA). Dept. of Animal Science)
The basic problems inherent in the estimation of maternal effects are considered. A maternal effect is defined as an effect contributed to the phenotypic value of an offspring by his dam. The two most important problems are the confounding of the maternal effect of the dam and her genetic contribution to the genotypic value of her offspring and the possibility of a negative genetic correlation between the direct and maternal effect. The literature on maternal effect theory is reviewed. A general genetic model for the study of maternal effects is developed. Then problems arising in the estimation of genetic variance and covariance using covariances between relatives are studied and the examination of problems arising in the estimation of maternal effects for genetic groups and their cross combinations are considered.
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