Abstract
Abstract MALE ring-necked pheasants undergo an annual cycle in body weight with loss of weight occurring during spring, i.e. the breeding season; weight gain occurs subsequent to regression of the testes and is accompanied by hyperphagia, molt (Nagra et al., 1962), and adrenal involution (Kirkpatrick, 1944). Prolactin causes atrophy of the testes (Breneman, 1942) and stimulates molt (Juhn and Harris, 1958) in chickens. Therefore, it is conceivable that a postnuptial elevation in output of this peptide hormone might elicit a state of anabolism in the pheasant. Adrenal steroids are lipogenic and induce hyperphagia in chickens (Baum and Meyer, 1960; Meyer and Baum, 1960), and assuming the above mentioned seasonal fluctuation in adrenal weight among male pheasants reflects an alternation in secretory condition, one might surmise that this gland also plays a role in evoking the postnuptial increase in body weight. Because of these data it became of interest to determine whether…
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