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ABSTRACT: Antimicrobials are currently used in poultry for disease treatment. However, their excretion in bird feces may contaminate the environment. Considering this, the objective of this work was to quantify antimicrobials residues concentrations in therapeutically treated broiler chicken droppings throughout the post-treatment period. For this aim a multiresidue method using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was validated. Forty-eight male broiler chickens were distributed and treated with commercial formulations of 5 different antimicrobials. Results showed that oxytetracycline and 4-epi-oxytetracycline, presented the highest concentrations during all sampling period, detecting concentrations of 1471.41 µg kg−1 at the last sampling point (day 22 post-treatment). Florfenicol, tylosin, enrofloxacin, and ciprofloxacin were eliminated and detected in treated chicken droppings until d 18 post-treatment. Sulfachloropyridazine decrease gradually during post-treatment period until day 30. Results demonstrate that studied antimicrobials in treated chicken droppings were eliminated for prolonged periods, therefore becoming a significant route of residues dissemination into the environment.

Chile is the second largest producer of salmon in the world and is an important pillar of the national economy. Any disruption in how the industry functions will have economic and social effects. The objective of this study was to evaluate the impact of the COVID-19 pandemic on the Chilean salmon industry. An online survey was sent to the highest positions in the industry: presidents, managers, and chiefs of salmon companies. Of the 52 respondents, 75% indicated that operations were moderately affected by the pandemic. More than 70% reported a decrease in their company's production and sales. Work absenteeism was a concern for 88%, and the implementation of sanitary measures was considered effective and relevant to prevent the spread of the virus. However, there were no statistically significant differences (p-value > 0.05) between the degree of impact on operations by company size, or between absenteeism and company size. The information obtained in this study is a first look into understanding the impacts of the pandemic on the Chilean salmon industry in the year 2020., Competing Interests: The authors of this study declare that they have no conflicts of interest that have influenced the work carried out and its results., (© 2022 Published by Elsevier Ltd.)