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The Effect of Feeding Soybeans on Blood Plasma Carotene and Vitamin A of Dairy Calves^{1, 2,}

Dairy Department, Maryland Agricultural Experiment Station, College Park

ABSTRACT

Conclusions: In all cases in which the concentrate ration contained 30% soybeans, either cooked or raw, and the carotene intake was 32 per pound of body weight, the plasma vitamin A levels of the calves were much lower than those in the control animals and lower than would be considered safe. The data indicate that a minimum of approximately 64 of carotene per pound of body weight is needed to provide a safe margin for young calves when soybeans make up as much as 30% of the ration. The blood plasma vitamin A was also depressed by the feeding of soybeans when vitamin A was provided in the form of vitamin A ester. Thyroprotein did not prevent the depression of plasma vitamin A caused by the feeding of soybeans.

¹ Scientific Article No. A457, Contribution No. 2532, of the Maryland Agricultural Experiment Station.

² The experimental data in this paper are in part from a thesis presented by the senior author in partial fulfillment of the requirements for the degree of Master of Science in Dairy Husbandry, University of Maryland.

³ Now at Virginia Polytechnic Institute, Blacksburg.