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Journal of Dairy Science Vol. 50 No. 7 1158-1160
© 1967 by American Dairy Science Association ®
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Levels of Progesterone in Peripheral Blood Plasma During the Estrous Cycle of the Bovine1

E. D. Plotka, R. E. Erb, C. J. Callahan and W. R. Gomes2

Departments of Animal Sciences and Veterinary Clinics and Medicine, Purdue University, Lafayette, Indiana

ABSTRACT

Progesterone was measured in 108 samples of peripheral blood plasma from 12 animals by a double-isotope derivative method, to define changes during the estrous cycle. Progesterone averaged 16.2 ± 0.8 ng/ml (10–9) of blood plasma. Significant (P < .01) differences were observed between averages for two-day intervals during the estrous cycle. Plasma progesterone averaged 13.3 ± 2.0, 10.1 ± 1.1, 9.9 ± 1.1, and 10.6 ± 1.7 ng/ml, respectively, for 1 to 2 days before estrus, the day of estrus, and two and six days after estrus. Similarly the averages were 18.4 ± 3.3, 20.4 ± 3.1, 25.8 ± 3.9, and 19.4 ± 1.8 ng/ml for 10, 12, and 14 days after estrus and 3 to 4 days before the subsequent estrus. Averages for 4 and 8 days after estrus and 5 to 6 before the subsequent estrus ranged from 17.1 to 17.7 ng/ml. Averages for progesterone concentration were significantly higher for Day 14 (P < .05) and three to four (P < .01) and five to six (P < .05) days before a subsequent estrus, as compared to the day of estrus and 2 and 6 days after estrus. Similarly, the Day 12 average was significantly (P < .05) higher than averages for the day of estrus and two days after estrus, and Days 3 to 4 before estrus averaged significantly (P < .05) higher than 1 to 2 days before estrus.

FOOTNOTES

1 Journal Paper no. 2987, Purdue University Agricultural Experiment Station, 47907.

2 Present address: Department of Dairy Science, The Ohio State University, Columbus, Ohio.






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