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Journal of Animal Science, Vol 69, Issue 6 2379-2386, Copyright © 1991 by American Society of Animal Science

JOURNAL ARTICLE

Life span of beef-type Bos taurus and Bos indicus x Bos taurus females in a dry, temperate climate

C. M. Bailey
University of Nevada, Reno 89557.

Females representing Hereford, Red Poll, F1 Hereford x Red Poll, F1 Red Poll x Hereford, F1 Angus x Hereford, F1 Angus x Charolais, F1 Brahman x Hereford, and F1 Brahman x Angus breed types were evaluated from birth until 10 yr of age. Of 308 females born alive, 35.7% died or were culled because of injury, serious illness, or reproductive failure. Breed types differed (P less than .01) in total number of mating seasons per cow and total number of progeny born and weaned. Values for lifetime total number of calves weaned were as follows: Hereford, 4.54; Red Poll, 5.45; Hereford x Red Poll, 4.45; Red Poll x Hereford, 5.49; Angus x Hereford, 5.98; Angus x Charolais, 5.57; Brahman x Hereford, 6.96; and Brahman x Angus, 6.22. Brahman crosses (P less than .01) and Angus x Charolais (P less than .10) exceeded Hereford dams in lifetime total number of calves weaned but did not differ from Angus x Herefords. Analysis of the Hereford-Red Poll diallel showed no evidence of heterosis in life span traits. Results indicate that breed type was a major source of variation in reproductive life span of beef-type females. F1 Bos indicus crosses and Angus x Herefords were outstanding in longevity.


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G. E. Martinez, R. M. Koch, L. V. Cundiff, K. E. Gregory, and L. D. Van Vleck
Number of calves born, number of calves weaned, and cumulative weaning weight as measures of lifetime production for Hereford cows
J Anim Sci, July 1, 2004; 82(7): 1903 - 1911.
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Copyright © 1991 by the American Society of Animal Science.