J. Anim Sci.
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J. Anim Sci. 1988. 66:835-840.
© 1988 American Society of Animal Science
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Breed type x Management Treatment Interactions of Cows Grazing Rangelands

J. W. Halloway1, J. F. Baker2, A. D. Chamrad3, P. O. Reardon4 and L. W. Varner1

Texas Agricultural Experiment Station, Uvalde 78801 and College Station 77843

Abstract

Data were collected on 1,852 calves weaned over a 7-yr period for Brahman x Angus F1, Brahman x Hereford F1 and Santa Gertrudis crossbred females allotted to three range management treatments. These treatments included: 1) high-intensity management involving a six-pasture, one-herd short-duration grazing system with about 20% of range seeded to Buffelgrass, 2) medium-intensity management involving a four-pasture, three-herd deferred rotation with about 10% of range consisting of Buffelgrass and 3) low-intensity management involving continuous grazing of native range. The three treatments resulted in similar (P > .10) weaning weights, although the medium-intensity calves tended to be heavier. Low-intensity management resulted in smaller (P < .05) average cow weights. Under medium-intensity management, cows tended to wean fewer calves over the 7 yr. Santa Gertrudis crossbreds maintained heavier (P < .01) cow weights and tended to be taller than other breeds, although this effect was greatest for medium-intensity management. Santa Gertrudis cows weaned lighter (P < .05) calves in the low-intensity treatment, whereas under medium-intensity management, weaning weights were similar (P > .05). With high-intensity management Brahman-Angus cows weaned heavier (P < .05) calves. The lower the weaning weight, the greater the weaning weight difference between breed types. The F1 breed types apparently were more adapted to nutritional stress than were Santa Gertrudis crossbreds.

Footnotes

1 Texas A&M Res. and Ext. Center, 1619 Garner Field Road, Uvalde.

2 Dept. of Anim. Sci.

3 Present address: Soil Conservation Service, Bismarck, ND 58502.

4 Present address: Chaparrosa Ranches, P.O. Box 489, La Pryor, TX 78872.






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Copyright © 1988 by the American Society of Animal Science.