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Potential Services of a Bull Frequently Ejaculated for Four Consecutive Years

University of Illinois, Urbana

ABSTRACT

The literature contains a number of reports on the effects of frequency of semen collection on sperm production and libido of dairy bulls, but no report has established a maximum frequency. Where fertility data have been obtained in connection with such studies, no critical change in fertility level has been attributed to the frequency of collection. Although it has been shown that sperm numbers in the bull are restored to normal 24 hours after exhaustive semen collections (3, 4), it is still common practice in artificial insemination units to collect semen from each bull only once each week or even less frequently. Satisfactory semen production and libido are maintained in most bulls with weekly collections. Few attempts have been made to collect semen more frequently, although the demand for semen from valuable sires often would warrant such a practice if it were not detrimental to the bull and his fertility.

Data were reported previously from this laboratory on the effect of semen collection frequencies of once, twice, and thrice per week with young Holstein bulls (1).

¹ Present address: North Louisiana Hill Farm, Homer, La.