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The Effect of Adding APF Supplements and Concentrates Containing Supplementary Growth Factors to a Corn-Soybean Oil Meal Ration for Weanling Pigs¹

University of Illinois³

Abstract

Three tests are reported in which weanling pigs were fed a 20% crude protein corn-soybean oil meal basal ration in drylot. The intramuscular injection of 1 ml. reticulogen per pit; per week did not improve the rate of gain over that produced by pigs not receiving the reticulogen treatment when 9 vitamins of the B complex were included in the basal ration. The basal ration including expeller soybean oil meal and 7 vitamins of the B complex was improved although not significantly so by either 4% dried whey product with whey fermentation solubles, 5% meat scraps or .05% Merck's APF supplement, while the addition of 1.1% Lederle's APF supplement significantly improved the rate of gain.

When the basal ration contained solvent soybean oil meal, growth rate was not improved by the addition of either choline chloride or Merck's APF supplement. The latter supplement and all other

¹ Acknowledgment is made to the A. E. Staley Manufacturing Company, Decatur, Illinois, and the Central Soya Company, Fort Wayne, Ind., for providing funds and products used in this study. Thiamine, riboflavin, niacin, pantothenic acid, pyridoxine, folic acid and an APF supplement were contributed by the Lederle Laboratories, Pearl River, New York. The APF supplement number 3 and choline chloride were supplied by Merck and Company, Rahway, New Jersey. The dried whey product with whey fermentation solubles and the whey yeast were kindly supplied by the Western Condensing Company, Appleton, Wisconsin. The reticulogen was supplied through the courtesy of the Eli Lilly and Company, Indianapolis, Indiana.

² Experiments 1 and 2 were conducted in partial fulfillment for the Degree of Doctor of Philosophy in Animal Science.

³ Animal Science Department, Urbana, Illinois. The assistance of R. H. McDade, Swine Herdsman, and his co-workers in conducting these experiments is greatly appreciated.