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Comparisons of mean antibiotic consumption between P1 and P2 measured as ALEA (a) and as mg/PCU (b). The bars represent the average value of antibiotic usage obtained from all farms during the two periods. Two datasets for each indicator (ALEA and mg/PCU) were analyzed by Kruskal-Wallis test; ‘*’ means p < 0.05 and ‘•’ means p < 0.10.
