Abstract
Summary
A study was made of the effect of feeding young calves definite quantities of vitamin D, in the form of cod liver oil concentrate or irradiated yeast for periods of time ranging from 164 to 210 days, on the resultant storage of this substance in the blood and in the liver of the animal. From the data obtained in this study, it is concluded that only a relatively small percent of the antirachitic intake of the calf is stored in the blood and in the liver. The concentration of the antirachitic factor per unit weight was found to be approximately equal in the 2 tissues studied. Natural vitamin D as found in cod liver oil and activated ergosterol as found in irradiated yeast seem to be stored at about the same degree of efficiency.
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