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Apparent Carotenoid Increases in the Digestive Tract of Beef Cattle

Ruminant Division, Department of Animal Science, University of Illinois, Urbana, Illinois

Carotenoid determinations were made on haylage, hay and the feces of cattle fed these roughages. Excretion of ß-carotene and other carotenoids was much greater than the amount contained in the haylage and was about equal to that contained in the hay. Apparent increases in ß-carotene and total carotenoid were observed in haylage samples incubated with hydrochloric acid when concentrations approximated the conditions found in the abomasum, but this did not account for the total amount of pigment in the feces. This apparent increase was probably due to a releasing of residual carotenoids not extracted by the usual procedures.