Abstract
ABSTRACT A DEFICIENCY of lysine causes a depigmentation of the hair coats of rats (Vohra and Kratzer, 1956); and feathers of chickens (Patrick, 1953; Klain et al., 1957a) and turkey poults (Fritz et al., 1946; Grau et al., 1946). A number of vitamins have been related to the development of normal pigmentation in animals. Diets which are deficient in pantothenic acid caused graying in rats, mice (Morgan and Simms, 1940; Gyorgy and Poling, 1940a, b; Unna and Sampson, 1940; Singer and Davis, 1950), and chickens (Groody and Groody, 1942). Biotin deficiency also caused failure of pigmentation of hair of rats and mice (Gyorgy and Poling, 1940; Quevedo, 1956). Folic acid prevented graying of rats on diets containing sulfaguanidine (Martin, 1942) and succinylsulfathiazole (Wright and Welch, 1943). A deficiency of folic acid appeared to cause depigmentation in the feathers of chickens (Briggs and Lillie, 1946; Frost et al., 1946; Klain et al., . . .
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