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Journal of Animal Science, Vol 71, Issue 12 3273-3279, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

Genotype x environment interactions in postweaning performance to yearling in Angus, Brahman, and reciprocal-cross calves

M. A. Brown, A. H. Brown Jr, W. G. Jackson and J. R. Miesner
South Central Family Farm Research Center, ARS, USDA, Booneville, AR 72927-9214.

Data from 431 Angus, Brahman, and reciprocal-cross calves were used to evaluate performance from weaning to yearling in calves managed during the winter on dormant common bermudagrass or endophyte-infected tall fescue (backgrounding environments). Calves on bermudagrass were weaned at heavier weights (P < .01) but gained less postweaning (P < .01). Weights at 365 d, 365-d hip heights, and 365-d weight:height ratios were similar between calves on different backgrounding environments averaged over breed. There was evidence that heterosis for postweaning ADG was larger in calves managed on endophyte-infected tall fescue (P < .05), but heterosis estimates for 205-d weight, 365-d weight, 365-d hip height, and 365-d weight:height were similar between backgrounding environments. Maternal and direct effects did not significantly interact with backgrounding environment, but there was a trend for maternal effects of 205-d weight, 365-d weight, and 365-d weight:height to be larger on the common bermudagrass environment than on the tall fescue environment. There was also a trend for direct breed effects for postweaning ADG and 365-d hip height to be larger on the common bermudagrass environment. These data indicated that genetic effects may vary with production environment and that consideration should be given to environment when developing crossbreeding systems.


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Copyright © 1993 by the American Society of Animal Science.