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

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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).