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Inhibition of premature ovulation by prolactin in the hen.

Abstract PROLACTIN is a pituitary hormone which is known to induce broodiness in some breeds of chickens (Riddle et al., 193S; Saeki and Tanabe, 1955). Although the site of action of prolactin in causing broodiness has not been clearly demonstrated, successive injections of this hormone into the chicken were found to cause a decrease in ovarian and oviducal weights in the female (Bates et al., 1935) and testicular regression in the male (Nalbandov, 1945). Similar antigonadal effects of prolactin have also been reported in several other avian species (Bates et al., 1937; Bailey, 1950; Meier and Dusseau, 1968; Meier, 1969). However, most studies were conducted on the weight of gonads in the male and not on ovulation in the female. The present experiments were carried out to elucidate whether prolactin inhibits LH induced premature ovulation by acting directly on the ovarian follicle in the hen MATERIALS AND METHODS White Leghorn hens…