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Metabolism of Ornithine in Perfused Goat Udder

Department of Physiology, Veterinary Faculty of the University of Ghent, Casinoplein 24, B-9000 Ghent, Belgium
Division of Research and Laboratories, International Atomic Energy Agency, Kartner Ring 11, P. O. Box 590 A-1011 Vienna, Austria

ABSTRACT

Four lactating goat mammary glands were perfused for several hours in the presence of ornithine labeled with 1-carbon-14 and -nitrogen-15 or 5-hydrogen-3 and received adequate quantities pf glucose, acetate, and amino acids. For the first label carbon and nitrogen were incorporated in casein of milk. After isolation of the casein amino acids the carbon-14 was incorporated into proline only while nitrogen-15 was localized in aspartic acid, glutamic acid, alanine, serine, glycine, and the branched-chain amino acids. In the experiments with hydrogen-3 labeled ornithine, no reversible transamination of ornithine could be measured during passage through the udder. After incubation in vitro of goat blood in the presence of the labeled ornithine, no nitrogen-15 could be detected in other free amino acids of plasma. Ornithine is transaminated by the udder itself. The -amino group of ornithine contributed nitrogen for the synthesis of several nonessential amino acids in the mammary gland.

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