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Relationship between Plasma Vitamin A and Liver Vitamin A in Calves Fed a Vitamin A Depletion Ration and Calves Fed Minimum Levels of Vitamin A or Carotene¹

Animal Industries Department, Storrs Agricultural Experiment Station

Geoffrey Beall

Statistics Department, University of Connecticut, Storrs

L. A. Moore

Dairy Husbandry Research Branch, USDA, Beltsville, Md.

ABSTRACT

Data on blood plasma vitamin A and liver vitamin A concentrations from 58 Guernsey and Holstein calves fed a vitamin A depletion ration and whose average age and body weight was 128 ± 19 days and 263 ± 72 lb., respectively, and from 39 Holstein calves fed minimum levels of vitamin A or carotene and whose average age and body weight were, respectively, 200 ± 9 days and 436 ± 48 lb. were explored as to possible relationship. When plasma vitamin A and liver vitamin A were expressed as logarithms, a positive linear relationship was found between these two variables. In calves fed the vitamin A depletion ration, the blood plasma vitamin A level was found to be less at a given concentration of vitamin A in the liver than in the calves fed minimum levels of vitamin A or carotene. Positive linear relationships of log liver vitamin A concentration on log plasma vitamin A concentration were derived for purposes of estimating liver stores of vitamin A in calves fed the vitamin A depletion ration and in calves fed minimum levels of vitamin A or carotene. These had applicable limits for prediction of approximately 3.6 and 25.8 of vitamin A per 100 ml. of blood plasma.

¹ This study was supported in part with funds provided by the Chas. M. Cox Co., Boston, Mass. and the Big-Y-Foundation, Norwich, Conn., as well as funds provided by the Research and Marketing Act through a contract between the Storrs Agricultural Experiment Station and the Dairy Husbandry Research Branch. A portion of the data is from a thesis to be presented to the Graduate School of the University of Connecticut by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy.