Abstract
Broodiness was induced in laying fowls of broody races by the injection of prolactin, by Riddle, Bates, and Lahr.1 After prolactin injections laying fowl of non-broody races and males of a broody race became only partially broody, usually clucking without nesting. Burrows and Byerly2 showed that pituitaries from broody fowl have a much greater prolactin content than those from laying fowl and from males, as judged by local pigeon crop-gland response to pituitary implantation.The present work was undertaken to determine the relative potency of fowl pituitaries with respect to genetic constitution of the fowls. White King pigeons of 8-10 weeks conception age were used as recipients for the fowl pituitaries. The local implantation technique of Lyons as described by McQueen-Williams3 was used. The crop-gland responses were recorded as “plus” when any visible stimulation was obtained, “2 plus” when the stimulation was roughly twice the minimal visible response, and so on.Crossbred females were used in their se...
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