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Plasma and Urinary Components in Vitamin A-Deficient Ewes¹

University of Kentucky, Lexington 40506

Abstract

POLYURIA accompanied by changes in the composition of plasma and urine has been reported in vitamin A-deficient heifers (Woelfel et al., 1965) and vitamin A-deficient wethers (Webb et al., 1968). Altered adrenal metabolism was offered as a possible explanation for the wether data. The experiment reported here continued this area of investigation with the following specific objectives: (1) to determine if vitamin A deficiency produces a pattern of changes in the composition of plasma and urine of ewes similar to that previously observed in wethers, (2) to study the effects of various stages of vitamin A depletion on plasma and urine composition and (3) to perform exploratory assays on plasma and urine for hormones related to adrenal metabolism.

Experimental Procedure

Seven crossbred ewes were fed 908 g of the vitamin A depletion ration previously described (Webb, Mitchell and Little, 1970) and seven were fed this ration supplemented with 3,122 IU vitamin A palmitate per kg of ration.

¹ The investigation reported in this paper (No. 69-5-135) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

² Present address: Department of Animal Science, Virginia Polytechnic Institute, Blacksburg, Virginia.