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INTRODUCTION LILLIE and Briggs (1947), in a study of the folic acid content of different feedstuffs by the chick assay method, found that menhaden meal showed no folic acid activity. Lillie, Combs and Briggs (1950) reported that feeds composed largely of cereal grains and animal protein concentrates may be low in folic acid. Biely et al. (1951) showed that when fish meal alone replaced the combination of soybean oil meal, fish meal and meat meal ordinarily used in the high energy Connecticut broiler ration, the growth rate of chicks fed the ration was lowered. It was suggested that the elimination of soybean oil meal from the ration lowered the folic acid content of the ration below the optimum requirement of the chick. Biely, March and Tarr (1952) further reported that the high temperatures employed in the flame drying process in the commercial manufacture of herring fish meals are responsible for … |
