Postweaning growth performances of 1610 young bulls were recorded in both feedlot and under pasture. (Co)variance components were estimated using a multivariate restricted maximum likelikhood analysis. The pedigree file included 22472 animals. Heritability estimates for weights and gain in both phases correspond to most previously reported estimates. The genetic correlation of gain between the two phases was -0.10, suggesting a large genotype x nutritional regime interaction and a major re-ranking of animals breeding values accross environments. Results of this analysis therefore suggest the need for environment-specific breeding values for postweaning gain.

S. J Schoeman, G. F Jordaan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 267–270, 1998
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