Plasma Levels of Progesterone and Oestradiol-17 β in Reindeer (Rangifer Tarandus Tarandus) During Pregnancy |
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| Authors: | A K Blom
V Sjaastad E Jacobsen |
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| Institution: | 1.Department of Physiology, Norwegian College of Veterinary Medicine, P.O. Box 8146, Dep., Oslo 1, Norway ;2.Institute of Medical Biology, University of Tromsø, and the Norwegian State Reindeer Research, Harstad, Norway |
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| Abstract: | The plasma concentrations of progesterone and oestradiol-17p during pregnancy and the first 20 days after parturition were estimated in reindeer. The concentration of progesterone in the period 75–25 days prior to parturition was significantly higher than in the period 200– 75 days prior to parturition (P < 0.001). During the last 25 days before parturition the concentration decreased significantly. The concentration of oestradiol-17β was in most cases below 70 pg/ml until 50 days prior to parturition. During the last 25 days of pregnancy there was a significant increase in oestradiol-17β and the ratio progesterone/ oestradiol-17β was markedly lower than in the period 75–25 days before calving.Key words: reindeer, gestation, plasma, progesterone, oestradiol-17β |
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