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Journal of Nutrition Vol. 62 No. 4 August 1957, pp. 475-488
Copyright © 1957 by American Society for Nutrition
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Application of the Protein Depletion-Repletion Technique in Baby Pig Feeding Experiments

II. Effect of Levels of Protein on Repletion Gains and Blood Serum Components of Baby Pigs1,2,

E. R. Peo, Jr.3, V. W. Hays, G. C. Ashton4, V. C. Speer, C. H. Liu and D. V. Catron

Department of Animal Husbandry, Iowa Agricultural Experiment Station, Ames

Thirty-six individually-fed baby pigs were used to determine the effect of 6 levels of protein (using dried skimmilk as the source of protein) on the repletion gains and certain blood constituents of protein-depleted baby pigs.

Maximum repletion gains and feed utilization occurred in the pigs fed 21 and 18% protein during the first and second repletion periods, respectively. Statistical analysis showed the quadratic responses to be significant at P=0.05 or less.

The effects of protein levels on the blood components studied were probably masked by changes in plasma volume. If plasma volumes had been determined, then it is possible that the protein source and levels might have had a significant effect on blood components. Of the blood constituents studied, the albumin/globulin ratio appears to be the most promising criterion of the effects of protein depletion and repletion and warrants further investigation.

1 Journal paper no. J-3113 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project no. 959.

2 Acknowledgment is made to Western Condensing Company, Appleton, Wisconsin and to Merck & Co., Inc., Rahway, New Jersey for grants-in-aid and materials which partially supported this research.

3 Present address: Department of Animal Husbandry, University of Nebraska, Lineoln.

4 Present address: Department of Physics, Ontario Agricultural College, Ontario, Canada.

Manuscript received 29 December 1957.




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