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Corpora Lutea Function and Pregnancy Maintenance in Gilts Following Unilateral Ovariectomy, Unilateral Uterine Horn Transection and Unilateral Ovariectomy-Uterine Horn Transection¹

University of Florida, Gainesville 32601

Abstract

A total of 47 crossbred gilts were randomly assigned to one of three treatment groups: Group I was unilaterally ovariectomized only and served as the control; Group II gilts had one uterine horn transected with both ovaries intact; and Group III gilts had one uterine horn transected and the ipsilateral ovary removed. Surgery was performed prior to the estrus at which the gilts were mated to test the hypothesis that a sterile uterine horn might not be luteolytic if there was no ipsilateral functional ovary since the stimulus for a uterus to produce a luteolytic factor might be "local" in nature. The pregnancy rate for Groups I, II and III was 87.5, 13.7 and 18.8%, respectively. Since the pregnancy rates for Groups II and III were significantly lower than for Group I but not significantly different from each other, the data suggest that a functional ovary ipsilateral to a non-gravid uterus is not required for that uterus to exert a luteolytic effect. One must conclude, therefore, that the stimulus for a sterile uterine horn to exert a luteolytic effect is systemic rather than local.

¹ Department of Animal Science, Florida Agricultural Experiment Station, Journal Series No. 4085.