Selection for Increased Incidence of Blood Spots in White Leghorns

Abstract

THE literature on the factors affecting the incidence of blood spots in chicken eggs was reviewed by Lerner and Taylor (1947a). Since that time a number of other publications on the subject have appeared, primarily bearing on the physiology of the production of blood spots (Nalbandov and James, 1949), on the relation between blood and meat spots (Denton, 1947; Jeffrey and Walker, 1950), on the nutritional control of blood-spotting (Nalbandov and Card, 1947; Carver and Henderson, 1948), and on the independence of blood-spotting from shell color (Quinn and Lee, 1949; Jeffrey and Walker, 1950). One abstract on the establishment of high and low blood-spotting lines in a flock of Rhode Island Reds (Quinn, Godfrey and Lee, 1948) has also been reported. From this and earlier reports (Quinn and Godfrey, 1940; Lerner and Smith, 1942; Jeffrey and Pino, 1943; Nalbandov and Card, 1944), it is apparent that genetic differences between birds .