The Relative Vitamin G Content of Dried Whey and Dried Skimmilk

The effect of riboflavin and the filtrate factor on egg production and hatchability

“…The addition of riboflavin stimulated hens to a better winter production similar to that induced by artificial lighting. This is not in agreement with results obtained by Heiman (1935) and Davis, Norris, and Heuser (1938 a and b), who found no relation between vitamin-G level and egg production.…”

“…The factor or factors seemed associated with some protein concentrates and with such feedstuffs as alfalfa, milk, liver, yeast, and fresh greens. Later work (Halpin, Holmes, and Hart, 1933;Bethke, Record, and Kennard, 1933 ;Heiman, 1935) indicated that vitamin G was the factor responsible. It is now known (Birch, Gyorgy, and Harris, 1935) that the term "vitamin G" as previously used in the literature covered the complex action of several vitamins.…”

The Rôle of Vitamin G in Reproduction in Poultry

“…Since the deficient diet contained approximately 100 Cornell units of vitamin G per 100 grams (Norris et al 1936), the results show that less vitamin G is required for egg production than is required for hatchability. It is clear from these results that no material effect in improving the hatchability of the eggs of the hens fed the deficient diet was exerted by the lactalbumin of dried whey, the source of vitamin G used in this investigation and one of the sources used by Bethke, Record, and Kennard (1933), Heiman and Norris (1933) and Heiman (1935). This agrees with the results of Bethke, Record, and Kennard (1936) who, since this investigation was completed, have reported that the increase in hatchability obtained by supplementing their basal diet with various sources of vitamin G is not associated with protein.…”

The flavins of milk

“…The vitamin G or the lactoflavin content of cow's milk apparently is proportional to the amount found in the rations. Furthermore, it has been shown that the amount of greenish yellow pigment in egg whites is distinctly related to the vitamin G in the hen's diet (10). Little work, however, has been done in this field.…”