Vitamin A and Carotene Content of the Blood Plasma of Dairy Calves from Birth up to Four Months of Age

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Abstract
The vit. A content of the blood plasma of calves of the Holstein, Ayrshire and Guernsey breeds from birth up to 4 mos. of age varies from 7.2-14 [gamma]/100 ml. These values are in the deficient range when compared with those for vit. A deficient calves at 1 yr. of age. This would indicate that some vit. A supplementation might be beneficial where difficulty in raising calves is encountered. The feeding of high-carotene lespedeza hay produced higher plasma vit. A values in young calves than No. 2 mixed clover and timothy hay.