Abstract
PFIFFNER and associates (1943) reported that a level of 250 micrograms of folic acid per 100 grams of a purified ration was sufficient to protect White Leghorn chicks from anemia and from stunted growth. Campbell, Brown, and Emmett (1944) showed that chicks receiving 100 micrograms of vitamin Bc per 100 grams of a synthetic ration had growth equivalent to that produced by a control group reared on a normal broiler ration.Petering, Marvel, Glausier, and Waddell (1946) found that concentrates prepared from a yeast extract, in amounts furnishing 22 to 44 micrograms of vitamin Bc activity, completely prevented folic acid deficiency symptoms and promoted good growth in White Leghorn cockerel chicks.At the Cornell Station, Robertson, Daniel, Farmer, Norris, and Heuser (1946) found that approximately 25 micrograms of folic acid per 100 grams of ration were required by White Leghorn cockerel chicks for survival to 6 weeks of age. These .
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