Fifth generation animals have been reared on 5 per cent of yeast as the sole source of vitamin B in the diet. This does not support the view that a new vitamin is necessary for reproduction. The majority of the young are not reared on synthetic diets containing as much as 8 per cent of yeast as the only source of vitamin B. 5 per cent of salt mixture 185 in the diet is detrimental to the production of young. The toxicity of yeast is not a factor because third generation animals have been reared on 45, 40, 35 and 30 per cent of yeast in the diet as the sole source of protein and vitamin B. It is believed that high mortality is due to a deficiency of vitamin B and not to vitamin X.
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Heller, V. G.
"The Possibility of a New Vitamin for Reproduction,"
Proceedings of the Iowa Academy of Science, 31(1), 281-281.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/66