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Proportion of erythromycin-resistant (A) or tylosin-resistant (B) fecal enterococci isolates for both treatments across all sampling days. Arrow indicates when antibiotics were withdrawn from the diet. Line styles distinguish the treatment. An “*” indicates days for which there was a significant difference between treatments (P < 0.05). For each treatment (day 0, 14, 84, 113, and 225 n = 50; day 49, 141, 169, and 197 n = 30).
