The Effects of Rations Containing Antibiotics and Trace Mineral Salt on the Chemical Composition and Physical Characteristics of Pork Carcasses

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Abstract
THE use of antibiotics in rations for swine and poultry has received widespread publicity since early in 1950 when it was first reported that aureomycin stimulated growth of the pig (Jukes et al., 1950). Since that time, many experiment stations have presented a great amount of evidence showing that antibiotics increase rate of gain and feed efficiency of pigs during the growing-fattening period from weaning to market weight. A review of these experiments by Wallace et al.. (1952) revealed that aureomycin, terramycin, streptomycin, penicillin, and bacitracin were all effective growth stimulants. However, the effects of antibiotic supplemented rations on the carcasses of these rapid gaining and fast growing pigs have not received a great amount of study, and the results of the experiments which have been reported are somewhat contradictory. The objective of this experiment conducted at the South Dakota Agricultural Experiment Station during 1951–52 was to determine the effects of rations containing aureomycin, terramycin, and trace mineral salt, supplied during all or part of the growing-fattening period, upon the chemical composition and physical characteristics of the carcasses from 200-pound market hogs fed in dry lot. Copyright © . .