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The Value of Several Supplements as Sources of Unidentified Growth Factors for Swine^{1, 2}

University of Arkansas^,4

Abstract

A statistically significant increase in rate of gain was obtained in 2 trials in which 2 percent of an enzymatically digested cod liver mycelium was added to a corn-soybean meal drylot ration fed to weanling pigs.

In one of two trials the addition of 3 percent condensed tuna fish solubles resulted in a significant improvement in rate of gain. In a second trial 2 percent tuna fish solubles failed to elicit an increased rate of gain. The greatest improvement in rate of gain from the fish soluble addition occurred in rations containing pre-press solvent processed cottonseed meal.

Inclusion of a fermentation product, rice bran, fish meal, and either the fat soluble or water soluble fractions of cod liver mycelium failed to significantly improve the rate of gain of pigs fed the corn-soybean meal basal ration. Addition of a fermentation product to a corn-soybean meal-degossy-polized cottonseed meal ration improved rate of gain, but the differences were not statistically significant.

¹ Journal Series Paper No. 1148, University of Arkansas, Fayetteville, Arkansas. Published with approval of the Director of the Arkansas Agricultural Experiment Station.

² The cod liver products used in these trials were furnished by the Silmo Chemical Corporation, Vineland, New Jersey, courtesy of Dr. David Molof. The fermentation product was furnished by Chas. Pfizer and Company, Terre Haute, Indiana, courtesy of Dr. Herbert Luther. The fish solubles were contributed by the Van Camp Laboratories, Terminal Island, California, courtesy of Mr. Roy Perett.

³ The authors wish to acknowledge Mr. C. J. Brown for his assistance in the statistical analysis of the experiments.

⁴ Department of Animal Industry and Veterinary Science.