AN APPLICATION OF THE PAIRED FEEDING METHOD TO THE QUANTITATIVE ESTIMATION OF THE RELATIVE VITAMIN A CONTENTS OF FOODS AND ARTIFICIAL CONCENTRATES

Abstract

This method is similar in principle to the one developed by H. H. Mitchell (Ibid. 104(3): 594-607) with reference to vitamin B. Application of this method to a definite sample of but-terfat, prepared from milk collected from stall-fed Guernsey cows, showed that 4.0 to 4.5% was required for maximum growth.