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Luteolytic Effect of a Bovine Uterine Powder on the Corpora Lutea, Follicular Development, and Progesterone Synthesis of the Pseudo-pregnant Rabbit Ovary¹

Department of Dairy Science, University of Maryland, College Park

ABSTRACT

Acetone dried powder preparations of late luteal and early estrual bovine uterus have been injected intraperitoneally into pseudo-pregnant rabbits. In 64% of the rabbits treated at a single dosage level, these uterine powders induced regression of corpora lutea, development of follicles, and a depression of acetate incorporation into progesterone during in vitro incubation of the ovaries. The same dosage of a similar abdominal muscle powder was without effect. It is proposed that these preparations contain a protein luteolytic hormone (ULH) which affects ovarian function without direct involvement of LH.

¹ Scientific Article no. A-1307, Contribution no. 3850 of the Maryland Agricultural Experiment Station, Department of Dairy Science. Supported in part by the Regional Research Project NE-41, ARS, USDA.