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Effect of the Administration of Unfractionated Gonadotrophic Pituitary Extracts during Estrus on Time of Ovulation in the Bovine¹

Department of Dairy Husbandry, University of Wisconsin, Madison

ABSTRACT

The effect of the administration of an unfractionated gonadotrophic pituitary-extract during estrus on time of ovulation of dairy heifers was observed. The mean time from the end of estrus to ovulation for periods when the heifers were treated was 1.01 hr. and for the untreated periods 11.74 hr. Length of estrus was not changed by the treatment as measured under conditions of this experiment.

¹ These data were taken from a thesis presented by G. B. Marion to the Graduate School of the University of Wisconsin in partial fulfillment of the requirements for a Ph.D. degree. Published with the approval of the director of the Wisconsin Agricultural Experiment Station.

² Present address, University of Minnesota, St. Paul.