Abstract
THE weight response of the baby chick’s comb to androgenic stimulation from testosterone and gonadotrophin injection has been changed by selection (Jaap, 1962; Nestor, 1964; and Nestor and Jaap, 1965).This report is concerned with the question of whether these genetic changes in hormone response during the first ten days after hatching persist into the pullet laying period. Also, whether changes in the response of cells in the baby chick’s comb are accompanied by changes in the response of other tissues of the bird’s body and whether these responses are age specific or persist throughout life. Should genetic capabilities be established early in life, it would be possible to predict future productive and reproductive performance soon after hatching of the chick.MATERIALS AND METHODSDetails of the origin and maintenance of the populations used in the study were given by Nestor (1964) and Nestor and Jaap (1965). One population designated …
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