UPTAKE OF [3H]PROGESTERONE BY THE ANTERIOR LOBE OF PITUITARY AND SOME OTHER TISSUES OF THE HEN DURING AN OVULATORY CYCLE

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Abstract
[1,2-3H]progesterone was injected i.v. into White Leghorn hens at various times during the period between ovulations of the initial ovum and the 2nd ovum (C2) of an egg-laying sequence, and the uptake of radioactivity was determined in tissues of the anterior lobe of pituitary, median eminence, telencephalon, liver, adrenal, magnum and pectoral muscle. The uptake by the anterior lobe of the pituitary changed during the ovulatory cycle showing a peak 8 h before C2 ovulation. Similar changes were also observed in the median eminence and in the magnum, but not in the other tissues examined.