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Supplementing salinomycin to diets for growing-finishing pigs.

Feeding experiments with growing-finishing pigs were carried out to study the effect of different dietary salinomycin concentrations upon animal performance. Besides a dietary treatment without antibiotic, three treatments consisted of 20/10 mg/kg, 40/20 mg/kg and 60/30 mg/kg salinomycin (the first and second number refer to the salinomycin content in grower and finisher diet, respectively). Compared to the control group, feeding diets with 20 or 40 mg/kg salinomycin resulted in significantly higher weight gain in the grower period (25-45 kg body weight), while also feed conversion was lower (although not statistically significant). In the finisher period (45-100 kg body weight) salinomycin had no significant effect upon weight gain or feed conversion efficiency, but the 20 and 30 mg/kg treatments yielded the best results. Considering the grower and finisher period together the dietary treatments 40/20 mg/kg and 60/30 mg/kg showed highest growth rate and most favourable feed conversion, although not statistically significant. Carcass characteristics (dressing percentage, carcass length, backfat thickness, percent meat) were not affected by dietary salinomycin supplementation.