Genetic and Environmental Interactions Affecting Weaning Weights of Hereford Calves

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Abstract
Data on 1,627 inbred and linecross Hereford calves were used to study the effects of year, sex, mating system, age of dam and the six two-factor interactions on weaning weight. Two separate analyses, a sample balanced analysis and a least-squares analysis, yielded similar results. The four main effects were highly significant, and the interaction effects of year × age of dam, sex × age of dam, sex × mating system and year × age of calf were significant. The assumption that the main effects act in an additive manner is not justified in these data and leads to some loss of precision in estimating the main effects. Copyright © 1966. American Society of Animal Science . Copyright 1966 by American Society of Animal Science