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Crystalline Vitamin B₁₂ in the Nutrition of the Baby Pig

Three Figures

Division of Animal Nutrition, University of Illinois, Urbana

J. B. Thiersch

Sloan-Kettering Institute for Cancer Research, New York, New York

Crystalline vitamin B₁₂ has been shown to be required by the baby pig. This vitamin and a pernicious anemia liver extract, when injected to supply approximately equal amounts of vitamin B₁₂ potency, produced equal responses in growth rate. The equality in growth response indicates that vitamin B₁₂ is the growth factor being supplied by the antipernicious anemia liver extract. The relation between the deficiency produced in baby pigs and pernicious anemia in man is discussed.