PEDIATRICS Vol. 29 No. 1 January 1962, pp. 90-96
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INFLUENCE OF PRIOR DIETARY PROTEIN LEVELS ON RESISTANCE TO THE STRESS OF PROTEIN DEPLETION

Oliver W. Vaughan Ph.D.1, L. J. Filer Jr. M.D., Ph.D.1, and Helen Churella M.S.1

1 (O.V.) Ross Laboratories, Columbus 16, Ohio

One-day-old piglets were fed diets of either 50% or 14% protein for 8 weeks; they were given intravenous injections with S35-methionine-labeled plasma protein and were given a nonprotein diet. The plasma protein turnover and the nitrogen excreted were estimated by measuring the S35 activity and the nitrogen in aliquots of blood, urine and feces. During a 102-day period of protein privation, the animals that had received the high-protein diet lost little weight, while pigs previously fed a low level of protein lost 4.4 kg. However the high-protein group had a considerably faster rate of plasma protein turnover, catabolized a much large quantity of protein, and excreted more S35 and nitrogen than did the low-protein group. It is concluded that high-protein diets may make pigs less well able to cope with the stress of sudden protein deprivation.




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