Distillers Dried Solubles as a Source of Unidentified Growth Factors Required by the Chick and Poult

SINCE the isolation of vitamin B12, distillers dried solubles (DDS), dried whey, butyl fermentation solubles, fish meal, grain juice concentrate, condensed fish solubles, liver preparations and dried brewers yeast have been shown to promote chick growth, even when the diets were considered to be complete with respect to all known nutrients (Hill et al., 1944; Carlson et al., 1949; Menge et al., 1949; Arscott and Combs, 1950; Hill and Briggs, 1950; Sunde et al., 1950; Combs, 1951; Couch et al., 1951; Heuser and Norris, 1951; Kohler and Graham, 1951; Reed et al., 1951). The subject has since been reviewed by Menge et al. (1952); Branion and Hill (1953); Rasmussen et al. (1956); Reid et al. (1958); Couch et al. (1960). Hill et al. (1944) were the first to show that DDS contained unidentified growth factor activity; this was later confirmed by Novak et al. (1947). Attempts to identify the growth. . .