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The Time of Ovulation and Rate of Spermatozoa Travel in Cattle

Michigan State College

Abstract

The time of ovulation and rate of sperm travel in mammals is a question of both scientific and practical importance. This study was carried out on both dairy and beef cattle. In the ovulation studies, 73 rectal examinations were made on 47 animals. Nine cows and heifers were slaughtered immediately after ovulation. Twent-two cows and heifers were slaughtered to study the rate of sperm travel.

The work reported here was conducted with the purpose of determining as nearly as possible at what stage of the estrual cycle ovulation occurs. Information was sought as to the difference in time of ovulation between the types and breeds of cattle, as to the influence of age upon the time of ovulation, as to which ovary functioned more often, and at what time of day ovulation, was most likely to occur. No attempt was made to determine the length of estrus.

The results reported in the literature on the time of ovulation in cattle have been variable and the number of animals used has been small.