Abstract
Summary 1.The vitamin A content of the blood plasma of calves of the Holstein, Ayrshire and Guernsey breeds from birth up to four months of age varies from 7.2 to 14 micrograms per 100ml. 2.These values are in the deficient range when compared with those for vitamin A deficient calves at one year of age. 3.Some vitamin A supplementation is indicated where difficulty in raising calves is encountered. 4.The feeding of high-carotene lespedeza hay produced higher plasma vitamin A values in young calves than No. 1 mixed clover and timothy hay.
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