Further Studies of the Activity of Crystalline Vitamin B12 for Chick Growth

Relation of Dietary Protein Content to Water intake, Water Elimination and Amount of Cloacal Excreta Produced by Growing Chickens

“…This is in good agreement with previous work by Ott et al (1948) when full growth stimulation was obtained with 3.0 ug. of B12 per 100 grams.…”

Studies on All-Vegetable Protein Rations

“…It was also found, in accordance with the reports of Nichol, Robblee, Cravens, Elvehjem (1947), that intramuscular injection of a commercial anti-pernicious anemia preparation gave improved growth. It has been recently reported by Ott, Rickes and Wood (1948) that crystalline vitamin B12 elicited growth responses comparable to those obtained by supplementation with crude materials. It seems likely that vitamin B12 is identical with or closely related to the unknown factor in fish solubles and liver which has been under investigation in these studies.…”

Relative Requirement and Source of Vitamin B12 for Turkeys and Chickens during the Later Stages of Growth

“…Later it was shown that crystalline vitamin B12 produced an effect on growing chickens comparable to the effect of crude sources of the unknown factor (Ott, et al, 1948;Lillie, et al, 1948). Although the possible existence of other effective growth factors in the feedstuffs and crude concentrates previously studied cannot be excluded, and although crystalline vitamin B12 has not yet been tested with turkeys, it seems justifiable to ascribe the previously observed growth-stimulating effect of cow manure, fish meal, and meat meal to vitamin Bi 2 potency.…”