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The Relationship of Semen Production to Sexual Excitement of Dairy Bulls¹

Laboratory of Animal Breeding and Artificial Insemination, Department of Animal Husbandry, Cornell University, Ithaca, N. Y.

ABSTRACT

In two experiments with 11 bulls each, restraining the bulls to induce sexual excitement was accompanied by highly significant (P < 0.01) increases in semen volume per ejaculate and in numbers of spermatozoa per milliliter of semen. The number of motile spermatozoa per ejaculate was 41 per cent greater (P < 0.01). These results emphasize the practical importance of procedures designed to induce and control sexual excitement in dairy bulls at the time of semen collection.

¹ The data published in this paper are from a thesis presented by the senior author to the Graduate School, Cornell University, in partial fulfillment of the requirements for the degree of Master of Science, September, 1950.

² Present address: Northern Illinois Breeding Co-op, Dundee, Ill.