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Comparison of Solvent Soybean Oil Meals and the Effect of Dried Whey Products and Antibiotics in Drylot Rations for Pigs¹

University of Illinois^,4

Abstract

In a drylot growing-fattening test with weanling pigs a regular solvent soybean oil meal, a "special" solvent soybean oil meal processed for 45 minutes at atmospheric pressure in the presence of live steam, and a high-protein solvent soybean oil meal were equally effective in promoting rate of gain when rations contained 20% crude protein were fed. The addition of 25 mg. aureomycin HCl per pound of ration increased gains very significantly (28%). Pigs receiving 5% dried whey-product with whey fermentation solubles and vitamin B₁₂ concentrate gained 15% faster than pigs receiving this product without the vitamin B₁₂ concentrate, but the difference was not statistically significant.

In a second experiment the effect on gains and carcass characteristics of adding 10, 20 or 40 mg. of streptomycin per pound of ration fed to growing-fattening pigs in drylot from 75 to 225 pounds in live weight was studied. Pigs receiving 10 mg. streptomycin per pound of ration gained significantly faster (11%) and pigs receiving 40 mg. streptomycin per pound gained very significantly faster (19%) than pigs fed the basal ration. There were no significant differences in thickness of backfat or in other physical carcass measurements studied. There was a very minor accumulation of the antibiotic in the loin tissue and backfat of hogs fed 40 mg. of streptomycin per pound of ration (1.3 mg. streptomycin per pound of loin tissue and 0.5 mg. streptomycin per pound of backfat).

¹ This study was supported by the donation of funds or products to the University of Illinois by the A. E. Staley Manufacturing Company, Decatur, Illinois; Central Soya Company, Inc., Decatur, Indiana; Western Condensing Company, Appleton, Wisconsin; Lederle Laboratories, Pearl River, New York; Merck & Co., Inc., Rahway, New Jersey; and Hiram Walker and Sons, Inc., Peoria, Illinois.

² Present address: General Mills, Inc., Detroit, Michigan.

³ Present address: Director of Research and Education, Central Soya Company, Inc., Decatur, Indiana.

⁴ Animal Science Department, Urbana, Illinois. The authors gratefully acknowledge the assistance of R. H. McDade, Swine Farm Foreman, and his associates.