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Progestin Levels in Jugular and Ovarian Venous Blood, Corpora Lutea, and Ovaries of the Nonpregnant Bovine¹

Departments of Dairy Science and Veterinary Clinical Medicine and Surgery, Washington State University, Pullman

ABSTRACT

Progesterone and ⁴-pregnene-20ß-ol-3-one (20ß-ol) were chemically assayed in 42 corpora lutea, ovaries (with corpora lutea removed), ovarian venous blood plasma, and jugular venous blood plasma samples collected from 31 non-pregnant dairy cows and heifers. Corpus luteum weights and progestin (progesterone plus 20ß-ol) content of corpora lutea increased significantly during the first 14 days of the estrous cycle and showed a precipitous decline to the next estrus. Total progestins in the ovary increased significantly to Day 11 postestrus, but levels were generally less than 2.0 µg/g. No progestin was detected in ovarian venous plasma at estrus or one day following estrus, but progestin concentrations in this plasma increased significantly from Day 2 of the estrous cycle to a peak value of 6.2 µg/ml on Day 15. Ovarian venous blood plasma progestins were significantly correlated to day of the cycle (r = 0.78) and corpora lutea concentrations of progestin (r = 0.55). Progesterone concentrations in jugular vein plasma did not reflect the stage of the cycle, progestin levels in tissues, or progestin concentrations in ovarian venous plasma. In no case was 20ß-ol found in jugular vein plasma.

¹ Scientific Paper No. 2288. Washington Agricultural Experiment Stations. This work was supported in part by state funds and conducted under Project No. 1585. Other funds came from Regional Project W-49, Physiological Mechanisms Affecting Fertility in Cattle.

² The data are from a thesis submitted by the senior author to the Graduate Faculty, Washington State University, in partial fulfillment of the requirements for the degree of Master of Science, April, 1962.

³ Present address: Department of Animal Sciences, Purdue University, Lafayette, Indiana.

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