Abstract
PERHAPS the earliest chick sexing method involved the application of “sex-linked inheritance mating,” Punnett (1919), Dunn (1923), Thompson and Black (1935), and Warren (1942). The next method to come into use was the Japanese or vent method, Masui and Hashimoto (1933), Forsyth (1934), Shrader et al. (1934), Gibbs (1935), Alder (1935), and Canfield (1940 and 1941).More recently, sex identification of several pure breeds by means of external characteristics has been demonstrated. Much of this work has been done with Barred Plymouth Rocks. Quinn and Knox (1939) depended largely upon the intensity of black pigment in the down and shanks of the chicks. They reported 83.5, 86.1 and 91.8 percent accuracy with three different lots of chicks. Jerome (1939) claimed 90 percent accuracy or better when only the regularity of the outline of the head spot was considered and 95 percent if the color of the legs was also taken .
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