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Genotype-Environment Interaction and Compensatory Growth in Sheep

University of California, Davis²

Abstract

An experiment was carried out with 40 individually fed ram lambs and 78 group fed wethers to study genotype-environment interaction in post-weaning gain, body measurements, wool and carcass data. The rams and wethers were the progeny of five and eight sires, respectively. Each sire family was divided at random into two groups, one of which was put on a poor ration and the other on a good ration for 7 weeks. Subsequently, all animals were fed the good ration for another 7 week period.

Significant sire by plane of nutrition interaction was found in only five of 38 comparisons, suggesting that this interaction is not a major source of variation even when the nutritional treatment effect is large.

Compensatory growth was made by both restricted groups, but there were no sire differences in compensatory growth.

¹ Faculty of Veterinary Science, P.O. Box 32, Khartoum North, Sudan.

² Department of Animal Science.