Effect of Percentage Zebu Breeding, Inbreeding and Weight at Different Periods on Calving Percent of Brangus and Africander-Angus Heifers

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Abstract
Research conducted in the Gulf Coast area of the United States has indicated Brahman-European crossbred cows have higher calving percentages than cows of the two parent breeds (Temple and Miller, 1961: Riggs et al., 1966; Reynolds et al., 1965; Chapman and England, 1965). Turner, Farthing and Robertson (1968) reported one of the major advantages of the Brahman-European crossbred cow has been the amount of heterosis shown for fertility. However, Warnick, Meade and Koger (1960) reported a 79% calving rate for cows of British breeding, a 63% calving rate for Brahman groups and intermediate rates for crossbred groups. Kincaid (1957) reported a 79% calving rate for cows studied in southeastern United States and a 73% calving rate for cows containing Brahman breeding. Kincaid (1957), Reynolds (1960), Warnick et al. (1960) and Koger et al. (1962) report low calving rates in nonparous Brahman-European crossbred heifers exposed to bulls at 2 years of age. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.

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