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Total and free plasma concentrations of progesterone, cortisol and oestradiol-17 beta during pregnancy, parturition and early lactation in sows



Total and free plasma concentrations of progesterone, cortisol and oestradiol-17 beta during pregnancy, parturition and early lactation in sows



Australian Journal of Biological Sciences 37(4): 267-276



The total (bound plus free) concentrations of progesterone, 20.alpha.-dihydroprogesterone, estradiol-17.beta. and cortisol were determined in the plasma of sows at 3 stages during pregnancy and more intensively from 5 days prepartum to 5 days postpartum. The free fractions of progesterone, estradiol-17.beta. and cortisol were measured in the same samples by a rate dialysis method. Up to day 110 of gestation, the amounts of free hormone in plasma did not fluctuate independently of their total concentrations. During farrowing, the total and free concentrations of progesterone and cortisol varied independently of each other, whereas total and free estradiol-17.beta. declined simultaneously. The initiation of parturition was associated with a decrease in circulating total progesterone, and was accentuated by a decrease in the free fraction (P < 0.005) so that its active free concentration was only 20% of its day 1 prepartum value. Total and free cortisol concentrations rose rapidly during labor so that at 12-18 h after birth of the 1st piglet 30% of that cortisol in maternal plasma was free hormone.

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Accession: 001498420

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PMID: 6525113



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