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Plasma estrone estradiol 17 beta and progesterone levels during late pregnancy and parturition in dairy cattle



Plasma estrone estradiol 17 beta and progesterone levels during late pregnancy and parturition in dairy cattle



Japanese Journal of Veterinary Science 50(3): 654-658



Levels of estrone, estradiol-17.beta., and progesterone in the peripheral plasma during late pregnancy and parturition in Holstein cows were measured by specific radioimmunoassay techniques. Estrone levels remained low until 4 weeks prepartum (<155 pg/ml), began to rise from 4 weeks until 1 day prepartum (155-2271 pg/ml), and reached a peak at parturition (2781 pg/ml). Then the levels fell to 197 pg/ml at 1 day postpartum. Changes in the plasma estradiol-17.beta. levels generally resembled those for estrone levels, but the estradiol-17.beta. levels were only 10-21% as compared to those of estrone levels. Progesterone levels remained high until 2 days prepartum (3.71 ng/ml), began to fall, reaching 2.52 ng/ml at 1 day prepartum and 0.75 ng/ml at parturition, and was 0.23 ng/ml at 1 day postpartum. On the day of parturition the levels of estrogens and progesterone remained approximately constant from the beginning of opening labor pains until 1 hr postpartum.

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Accession: 006129185

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PMID: 3210477



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