J. Anim Sci.
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Journal of Animal Science, Vol 74, Issue 3 542-544, Copyright © 1996 by American Society of Animal Science

JOURNAL ARTICLE

Repeated matings with individual ewes by rams differing in sexual performance

E. O. Price, R. Borgwardt, M. R. Dally and P. H. Hemsworth
Department of Animal Science, University of California, Davis 95616-8521, USA.

Twenty-four sexually mature rams were individually exposed to 10 estrous ewes on three occasions to determine the relationship between levels of sexual performance (ejaculation rate or serving capacity) and the incidence of repeated matings (ejaculations) with individual ewes. Rams that attained six ejaculations in a relatively short period of time (HP rams) mated fewer times with individual ewes than low-performing (LP) rams (P < .01). As a consequence, HP rams tended to mate with a greater number of different ewes than did LP rams (P < .06). In addition, time required to attain six ejaculations was inversely correlated with the number of different ewes mated (P < .03). The HP rams did not differ from LP rams in the number of different ewes investigated and courted. These findings highlight the value of using rams with relatively rapid ejaculation rates when breeding large groups of naturally cycling or synchronized ewes.




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Copyright © 1996 by the American Society of Animal Science.