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The Crossbred Sire: Experimental Results for Cattle^1,2,

University of Kentucky, Lexington 40546-0215

Abstract

Results comparing crossbred bulls relative to straightbred bulls for various reproduction traits (such as puberty, sperm concentration, pregnancy rate and weaning rate) and progeny growth traits (birth and weaning weight) were summarized separately for Bos taurus x Bos taurus (Bt·Bt) and Bos indicus x Bos taurus (Bi·Bt) crosses. The Bt·Bt and Bi·Bt crossbred bulls were 1.8 and 5.0% younger, respectively, at puberty than straightbred bulls. Also, sperm concentration of Bt·Bt and Bi·Bt crossbred bulls was greater than straightbred bulls by 36.4 and 56.0%, respectively. Pregnancy rate and weaning rate of cows exposed to straightbred and crossbred bulls indicated advantage values of .2 and 4.0%, respectively, for Bt·Bt crossbred bulls. Corresponding advantage values for Bi·Bt crossbred bulls over straightbred bulls were 1.4 and 3.7%, respectively, for these two traits. Birth and weaning weights were similar for calves sired by straightbred and Bi·Bt crossbred bulls as well as for calves sired by straightbred and Bi·Bt crossbred bulls.

¹ Published with approval of Director of Kentucky Agr. Exp. Sta. as Journal Article 86-5-127.

² Presented at a symposium on "The Crossbred Sire" held during 78th Annu. Meet, of ASAS, Kansas State Univ., Manhattan, July 30, 1986.