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Effects of Potassium Nitrate, Alpha-Tocopherol, Thyroid Treatments, and Vitamin A on Weight Gain and Liver Storage of Vitamin A in Fattening Lambs

University of Illinois, ^,2 Urbana

Abstract

A 2 x 2 x 2 x 3 factorial experiment was designed to test the effects of four factors on average daily gain and liver storage of vitamin A with lambs. The factors studied and their levels were as follows: vitamin A (0 and 98,000 I.U. per week), alpha-tocopherol (0 and 700 mg. per week); potassium nitrate, (0 and 4% of air-dry feed); thyroid treatments, (tapazole, 1.05 g. per week, control, and triiodo-1-thyronine, 700 mcg. per week). The average gain for all lambs for the treatment period was 0.53 lb. per head per day. Vitamin A, alpha-tocopherol, and potassium nitrate did not affect the rate of gain. Tapazole decreased rate of gain significantly; triiodo-1-thyronine increased rate of gain significantly. The interaction, thyroid treatments x potassium nitrate was significant. Exogenous vitamin A increased liver storage of vitamin A. All other treatments, main effects or interactions, had no significant effect on liver storage of vitamin A.

¹ Appreciation is expressed to Elanco Products Company, Indianapolis, Indiana, courtesy of Charles Jordan for supplying the thyroid compounds used in this study and Hoffman-LaRoche, Inc., Nutley, New Jersey, courtesy of Charles Adams for supplying the vitamin A.

² Department of Animal Science.