Abstract
NICHOL and associates (1949) found that when chicks (NH×WL) were supplied a diet containing approximately 1.5 mcg. of vitamin B12 per 100 grams, “the growth response compared closely with that of a group receiving 3 percent condensed fish solubles.” The rate of gain promoted by 3 percent fish solubles was observed in previous work to be approximately maximum. Stokstad and co-workers (1949) reported that depleted New Hampshire chicks fed diets containing 70 percent soybean oil meal required 1.5 mcg. of vitamin B12 per 100 grams of diet. Ott (1949), in an abstract of a paper prepared for presentation at the 116th meeting of the American Chemical Society, concluded that the resuits of experiments with chicks fed graded levels of crystalline vitamin B12 in a semi-purified high protein diet “indicate that the minimum requirement for maximum growth is close to 4 mcg. of the vitamin per 100 grams of diet.” When …
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