Effects of ageing and gonadal steroid hormones on prolagtin concentration in the anterior pituitary of the chicken

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Abstract
The effects of aging and gonadal steroid hormones on pituitary prolactin (PRL) concentration in the chicken were investigated. No difference was found in the qualitative electrophoretic patterns of the anterior pituitary homogenates at different ages and between the sexes. Pituitary PRL concentrations in males were generally higher than in females. Pituitary PRL concentrations in castrated immature cockerels were higher than in intact birds, while PRL concentration was depressed by the injection of testosterone propionate or estradiol benzoate. PRL concentration in intact immature cockerels was decreased by daily injection of testosterone or estradiol for 3 wk but not by injection of the hormones for 1 wk.