Dissipation of Antimicrobial Resistance Determinants in Composted and Stockpiled Beef Cattle Manure
作者： Shanwei Xu , Srinivas Sura , Rahat Zaheer , George Wang , Alanna Smith
关键词: Compost 、 Agronomy 、 Dry matter 、 Beef cattle 、 Manure management 、 Animal science 、 Chlortetracycline 、 Windrow composting 、 Manure 、 Biology 、 Tylosin
摘要: Windrow composting or stockpiling reduces the viability of pathogens and antimicrobial residues in manure. However, impact these manure management practices on persistence genes coding for resistance is less well known. In this study, from cattle administered 44 mg chlortetracycline kg feed (dry wt. basis) (CTC), CTC sulfamethazine (CTCSMZ), 11 tylosin (TYL), no antimicrobials (control) were composted stockpiled over 102 d. Temperature remained ≥55°C 35 d compost 2 stockpiles. Quantitative PCR was used to measure levels 16S rRNA tetracycline [(B), (C), (L), (M), (W)], erythromycin [(A), (B), (F), (X)], [(1), (2)] determinants. After d, all determinants declined by 0.5 3 log copies per gram dry matter. Copies affected ( = TYL > CTCSMZ. Compared with control, did not increase abundance either manure, except (M) (2) CTCSMZ < 0.05). The decline higher 0.05) than We conclude that may be more effective reducing introduction into environment before land application
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