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The Relative Efficiencies of Irradiated Ergosterol and Irradiated Yeast for the Production of Vitamin-D Milk¹

Departments of Dairy Industry and Animal Industry, Ohio Agricultural Experiment Station, Wooster, Ohio

ABSTRACT

Two groups of lactating Holstein cows were fed 60,000 rat units of vitamin D as irradiated ergosterol and 60,000 rat units of vitamin D as irradiated yeast daily. Two other groups of lactating Holstein cows were fed 120,000 rat units of vitamin D from the same sources daily.

Vitamin D assays of the milk produced by these groups of cows showed that the irradiated ergosterol was approximately two-thirds as efficient in allowing transfer of its vitamin D to the milk as was the irradiated yeast. No satisfactory explanation for this was found. It could not be attributed to a difference in absorption from the intestinal tract since the vitamin-D content of the feces and of the bloods was the same regardless of the supplement fed. The existence of different forms of vitamin D having different species effects is considered as a possible explanation, as is also a difference in the "disappearance" into the tissues of vitamin D from the two sources.

¹ Presented in part at the meetings of the American Dairy Science Association, at Urbana, Illinois, June 27, 1933.

² Formerly assistant in the Department of Animal Industry.