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Periparturient Concentrations of Prolactin, Progesterone and the Estrogens in Blood Plasma of Cows Retaining and not Retaining Fetal Membranes^{1 ,2,}

Purdue University, West Lafayette, IN 47907

Abstract

Blood was sampled daily from 22 Holsteins (15 cows and seven heifers) to compare concentrations of hormones in plasma among animals retaining (RFM) and those not retaining (NR) fetal membranes. Blood was collected 6.8 ± ; .3 days before to 2 days after calving. Six cows and one heifer did not release their fetal membranes within 12 hr post-partum (RFM). Average changes among days in concentrations of prolactin, progesterone, estrone, estradiol-17² and estradiol-17 (residual estradiol) in blood plasma were significant and similar to data reported by others. Compared to animals in Group NR, periparturiently, those in Group RFM had higher (P<.01) average progesterone (3.4 ± ; .3 vs 2.3 ± ; .1 ng/ml), lower (P<.06) average estradiol-17² (225 ± ; 22 vs 288 ± ; 20 pg/ml) and lower (P<.05) average prolactin (34 ± ; 3 vs 42 ± ; 3 ng/ml). There were no group differences for estrone and estradiol-17. No day X group interactions were significant except for estradiol-17 (P<.01). Concentrations of estradiol-17 increased daily from 6 to 1 days before calving in animals of Group RFM and decreased daily in animals of Group NR. Increased progesterone, decreased estradiol-17ß and possibly decreased prolactin in blood plasma of animals in Group RFM as compared to those in Group NR may indicate asynchrony of hormonal mechanism(s) that normally synchronize birth and release of fetal membranes.

¹ Journal Paper 6385, Purdue University Agricultural Experiment Station, West Lafayette, IN 47907. A contribution from the Department of Animal Sciences.

² Authors gratefully acknowledge G. D. Niswender, Colorado State University, N. R. Mason, Eli Lilly Co., and R. D. Randel, Texas A&M University for supplying antisera to progesterone, estradiol-17ß, and estrogen, respectively.

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