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
Sammendrag
Plasmakonsentrasjonene av progesteron og østradiol-17β ble un-dersøkt under drektighet og de første 20 dagene etter kalving hos reinsdyrsimler. Plasmakonsentrasjonen av progesteron i perioden 75–25 dager før kalving var signifikant lavere enn i perioden 200–75 dager før kalving (P < 0.001). I de siste 26 dagene før kalving var det en signifikant reduksjon i plasma progesteron. Plasmakonsentrasjonen av østradiol-17β var i de fleste tilfeller under 70 pg/ml inntil 50 dager før kalving. I de siste 25 dager av drektigheten var det en signifikant økning i plasma østradiol-17β og ratio progesteron/østradiol-17β falt market i forhold til perioden 75–25 dager før kalving.
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