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Journal of Dairy Science Vol. 57 No. 1 89-92
© 1974 by American Dairy Science Association ®
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Uterine Involution, Ovarian Activity, and Fertility after Melengestrol Acetate and Estradiol in Early Postpartum Cows1

J. H. Britt, D. A. Morrow, R. J. Kittok and B. E. Seguin

Animal Reproduction Laboratory, Department of Dairy Science, Michigan State University, East Lansing 48824

ABSTRACT

Twenty-seven Holstein cows were assigned to control, melengestrol acetate,2 or melengestrol acetate plus estradiol groups. Melengestrol acetate was fed 1 mg/cow per day for 14 days beginning 21 ±1 days after calving. Estradiol benzoate3 (500 µg) was injected intramuscularly 48 h after the last melengestrol acetate feeding. Cows were inseminated at first and any subsequent estrus after 50 days postpartum. Weekly palpation per rectum revealed diameter of the largest uterine horn decreased until 7 wk postpartum, but there was no significant difference among treatment groups. A temporary plateau in diameter of the largest uterine horn in cows treated with melengestrol acetate occurred the week after treatment. Cows receiving melengestrol acetate had more follicles > 1.0 cm diameter but only during treatment. There was no significant difference in interval to first ovulation or corpus luteum formation among the three groups. Control, melengestrol acetate, and melengestrol acetate plus estradiol group means for interval from calving to first estrus, days open for cows conceiving, and services per conception were 63±11, 37±9, and 41±7; 153±15, 83±6, and 101± 15; and 3.3±.8, 1.7±.3, and 2.1 ±.4. Values for the control group were higher than values for the other two groups. There was no difference in milk yield among the groups during the lactation in which melengestrol acetate was administered.

FOOTNOTES

1 Published with the approval of the director of the Michigan Agriculture Experiment Station as Journal Article No. 6488.






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Copyright © 1974 by the American Dairy Science Association ®.