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Effect of Percentage Zebu Breeding, Inbreeding and Weight at Different Periods on Calving Percent of Brangus and Africander-Angus Heifers¹

U.S.D.A., A.R.S. and Louisiana Agricultural Experiment Station, Jeanerette 70544^,4

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.

¹ Published with the approval of the Director of the Louisiana Agricultural Experiment Station. Cooperative with A.R.S., A.S.R.D., U.S.D.A.

² Iberia Livestock Experiment Station, Teanerette, Louisiana,

³ U. S. Range Livestock Experiment Station, Miles City, Montana.

⁴ Authors express appreciation for the assistance of Mrs. Mary E. Muffoletto (deceased) in preparation of data. Appreciation is also extended to Dr. P. E. Schilling, Department of Experimental Statistics. Louisiana State University, Baton Rouge, Louisiana, for assistance in statistical analysis.