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Application of the Protein Depletion-Repletion Technique in Baby Pig Feeding Experiments

I. A Comparison of Levels and Sources of Protein for Baby Pigs^1,2,

Department of Animal Husbandry, Iowa Agricultural Experiment Station, Ames

Sixty baby pigs were used in two experiments where the protein depletion-repletion technique was employed to measure the effectiveness of three different sources and 6 different levels of protein in promoting growth.

In the first experiment, the pigs that were protein repleted with dried skimmilk diets showed greater repletion gains on less feed per pound of repletion gain than those repleted with soybean oil meal diets with or without 0.1% of DL-methionine. There was little difference in the repletion gains or in feed utilization by the pigs fed the two soybean oil meal diets. Less of the methionine supplemented ration was required to produce a pound of gain, however this difference was not statistically significant.

When 6 levels of protein were tested using dried skimmilk as the source of protein, the greatest gains were made by the pigs repleted with 22% protein whereas the least gains were made by the pigs repleted with 12% protein. Statistical analyses of the data revealed that the quadratic regression component of ration treatment effects on gain was significant.

The feed required per pound of repletion gain decreased as the levels of protein were increased from 12 to 20%. The decrease was large from the 12 to 14% protein level and relatively small per interval of protein increment thereafter. The quadratic regression component of ration treatment effect on feed efficiency was statically significant.

Acknowledgment is made to Mr. Don Quinn, Swine Nutrition Research Farm Superintendent and his associates for their assistance; also to Professor P. G. Homeyer, Department of Statistics, for his advice and computational assistance with certain of the data.

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, Lincoln.

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

Manuscript received 29 December 1956.