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Turnover of Liver Vitamin A in Steers Fed a Low-Protein Ration^{1, 2,}

University of Kentucky, Lexington

Abstract

Six Hereford steers with previously established liver stores of tritium labeled vitamin A were fed rations containing 6% or 12% crude protein and sufficient vitamin A palmitate to maintain liver stores in a switchback study involving four periods lasting 56, 56, 70 and 126 days, respectively. Turnover time for vitamin A in the liver was estimated, using declining specific activity of vitamin A in liver samples taken by aspiration biopsy. Average turn over times of 138 days for steers receiving the 6% crude protein ration and 126 days for steers receiving the 12% crude protein ration were not significantly different. Tritium activity was detected in serum and urine throughout the study. Tritium activities of liver and serum were highly correlated.

¹ The investigation reported in this paper (No. 67-5-61) is in connection with a project of the Kentucky Agricultural Experiment Station and is published with the approval of the Director.

² This investigation was supported in part by Public Health Service Grant No. AM08355 from the National Institute of Arthritis and Metabolic Diseases.

³ Present address: Everglades Experiment Station, Belle Glade. Florida.