J. Anim Sci.
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Journal of Animal Science, Vol 75, Issue 4 920-925, Copyright © 1997 by American Society of Animal Science

JOURNAL ARTICLE

Genotype x environment interactions in Angus, Brahman, and reciprocal cross cows and their calves grazing common bermudagrass and endophyte-infected tall fescue pastures

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

Reproductive and preweaning data on 233 Angus (A), Brahman (B), and reciprocal-cross cows (AB, BA) and 455 two- and three-breed cross calves managed on common bermudagrass or endophyte-infected tall fescue were used to evaluate the interaction of forage type with individual and maternal heterosis and maternal and grandmaternal breed effects. Cows were born from 1988 to 1991 and calves from 15 Polled Hereford sires were born from 1991 to 1994. Heterosis for calving rate was similar and important on both forages (P < .01), but maternal effects were small on each forage. Maternal heterosis for birth weight differed between common bermudagrass and tall fescue (P < .10) and grandmaternal effects were evident on bermudagrass (P < .05) but not tall fescue. Forage effects were generally substantial for 205-d weight, weaning hip height, and weaning weight:height ratio (P < .01), and maternal heterosis for these traits was larger on tall fescue than on common bermudagrass (P < .01). Grandmaternal effects were in favor of Angus for 205-d weight, hip height, and weight:height ratio on common bermudagrass (P < .05) but not on tall fescue. Heterosis for 205-d weight per cow exposed was substantial on both forages (P < .01) and was numerically larger on tall fescue than on bermudagrass, but maternal effects were not significant. These results suggest more advantage for Brahman-cross cows over purebreds on endophyte-infected tall fescue than a similar comparison on common bermudagrass. They also suggest an advantage for Angus in grandmaternal effects on bermudagrass but not tall fescue.


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D. G. Riley, S. W. Coleman, C. C. Chase Jr., T. A. Olson, and A. C. Hammond
Genetic parameters for body weight, hip height, and the ratio of weight to hip height from random regression analyses of Brahman feedlot cattle
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 J ANIM SCIHome page
B. A. Sandelin, A. H. Brown Jr., M. A. Brown, Z. B. Johnson, D. W. Kellogg, and A. M. Stelzleni
Genotype x environmental interaction for mature size and rate of maturing for Angus, Brahman, and reciprocal-cross cows grazing bermudagrass or endophyte infected fescue
J Anim Sci, December 1, 2002; 80(12): 3073 - 3076.
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Copyright © 1997 by the American Society of Animal Science.