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Journal of Animal Science, Vol 71, Issue 5 1117-1122, Copyright © 1993 by American Society of Animal Science
JOURNAL ARTICLE |
M. A. Brown, L. M. Tharel, A. H. Brown Jr, W. G. Jackson and J. R. Miesner
South Central Family Farm Research Center, ARS, USDA, Booneville, AR 72927.
Daily milk yield and milk fat were estimated by method of milking machine in 60 Angus and 60 Brahman cows grazing common bermudagrass or endophyte-infected fescue during a 3-yr period. Averaged over monthly estimates, there was evidence (P < .05) of a dam breed x forage interaction in daily milk yield. Tall fescue decreased milk yield more in the Angus (1.64 kg/d, P < .01) than in the Brahman (.53 kg/d, P > .15). There were significant dam breed effects on both percentage of milk fat and daily milk fat yield; Brahman exceeded Angus by .68% (P < .01) and 34.3 g/d (P < .01), respectively. There were significant forage effects for both percentage of milk fat and daily milk fat yield; common bermudagrass exceeded tall fescue by .5% (P < .01) and 62.3 g/d (P < .01), respectively. These data indicate that incorporation of Brahman germplasm into a grazing system that uses endophyte-infected fescue may be beneficial in daily milk yield but will probably not prevent decreases in milk fat production associated with grazing endophyte-infected tall fescue.
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