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Genetic and Environmental Interactions Affecting Weaning Weights of Hereford Calves¹

Colorado State University, Fort Collins

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 x age of dam, sex x age of dam, sex x mating system and year x 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.

¹ Approved for publication as Scientific Paper SS 1113 of the Colorado Agricultural Experiment Station. This study was conducted in cooperation with Western Regional Research Project W-1, Improvement of Beef Cattle through the Application of Breeding Methods.

² Present address: Animal Husbandry and Dairy Research Institute, Pretoria, Republic of South Africa.

³ Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, U.S.D.A., Fort Collins, Colorado.

⁴ Department of Animal Science.