The Value of Several Supplements as Sources of Unidentified Growth Factors for Swine

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.