Abstract
It is known that postpartum mothers are much more likely than maternal virgins to retrieve pups from a T-maze extension of their home cage. By administering ergocryptine (Ergo), a prolactin inhibitor, to thelectomized (nipple-removed) females, it was demonstrated that prolactin release in the postpartum rat in response to nonsuckling pup stimulation is not responsible for this difference. Indirect indexes of prolactin inhibition included earlier onset of estrus and decreased mammary gland weight in Ergo-treated mothers. Ergo was not found to affect food intake.
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