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The aim of the study was to evaluate Polish medicated feedingstuffs for farm animals in terms of their content of active substances and homogeneity. Overall, 1889 samples of medicated feedingstuffs, medicated premixes, intermediate products and cleaning mixtures were examined from 2006 to 2010. Among medicated feeds, 151 (9.6%) did not comply with the declared antibiotic content or their homogeneity...
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