THE GROSS ACTION OF PROLACTIN AND FOLLICLE-STIMULATING HORMONE ON THE MATURE OVARY AND SEX ACCESSORIES OF FOWL

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Abstract
Data from 84 injected and 21 control fowl of 3 breeds show that prolactin and follicle-stimulating hormone (FSH) promptly induce opposite effects on the mature fowl ovary in both its laying and non-laying condition. Prolactin dosage during 9-17 days decreased the true ovarian tissue of resting ovaries by 25%. and that of active ovaries by 55%. The wt. of whole ovaries, including yolk, was decreased in laying birds to 10 or 20% of their original wt. Dosage with FSH during 6-16 days increased the true ovarian tissue of resting ovaries by nearly 150%, and that of active ovaries by 125%. The wt. of resting whole ovaries including yolk was increased ca. 1,000%. Oviducal (uterine) size, certainly regulated by the estrin-output of the ovary, is decreased 36-91% by prolactin. Wt. of oviduct was increased by FSH in 3 groups of non-laying fowl by 425, 300 and 90%, and in 3 groups of layers by 44, 29 and 5%. Size of comb and space between pubic bones decreased under prolactin dosage and increased under FSH. Indirectly prolactin decreased and FSH increased the output of estrin by the fowl ovary. Prolan and progestin in a total of only 4 tests gave adverse effects on active mature ovaries. Data concerning the nature and extent of the ovarian changes which accompany the induction of broody behavior by prolactin are presented.

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