The value of virginiamycin (Eskalin) as a feed additive for growing pigs in diets with or without a high copper supplement

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Abstract
In three trials, each involving 48 individually-fed pigs grown from 20 to 90 kg live weight, the value of virginiamycin as a performance-promoter either alone or together with 250 mg Cu/kg diet was examined. Both copper and virginiamycin on their own gave significant, although small, improvements in performance and the results suggested that there can be a degree of additive action between the two materials when both are added to the diet.