Abstract
Livestock manure is one of the most important pools of antibiotic resistance genes (ARGs) in the environment. Aerobic composting can effectively reduce the spread of antibiotic resistance risk in livestock manure. Understanding the effect of aerobic composting process parameters on manure-sourced ARGs is important to control their spreading risk. In this study, the effects of process parameters on ARGs during aerobic composting of pig manure were explored through data mining based on 191 valid data collected from literature. Machine learning (ML) models (XGBoost and Random Forest) were utilized to predict the rate of ARGs changes during pig manure composting. The model evaluation index of the XGBoost model (R2 = 0.651) was higher than that of the Random Forest (R2 = 0.490), indicating that XGBoost had better prediction performance. Feature importance was further calculated for the XGBoost model, and the XGBoost black box model was interpreted by Shapley additive explanations analysis. Results indicated that the influencing factors on the ARGs variation in pig manure were sequentially divided into thermophilic period, total composting period, composting real time, and thermophilic stage average temperature. The findings gave an insight into the application of ML models to predict and decipher the ARG changes during manure composting and provided suggestions for better composting manipulation and optimization of process parameters.
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Funding
This work was supported by Open Fund of Key Laboratory of Smart Breeding (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs (2023-TJAUKLSBF-2202), Tianjin Science and Technology Plan Project (23ZYCGSN00050), Tianjin Modern Agricultural Technology System Innovation (ITTPRS2021010), and Scientific Research Project of Tianjin Education Commission (2022KJ021, 2023KJ003).
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Xiaohui Yu: conceptualization, methodology, data curation, writing — original draft. Yang Lv: formal analysis. Qing Wang: data curation. Wenhao Wang: methodology. Zhiqiang Wang: formal analysis. Nan Wu: conceptualization, supervision, writing — review and editing. Xinyuan Liu: writing — review and editing. Xiaobo Wang: writing — review and editing. Xiaoyan Xu: funding acquisition.
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Yu, X., Lv, Y., Wang, Q. et al. Deciphering and predicting changes in antibiotic resistance genes during pig manure aerobic composting via machine learning model. Environ Sci Pollut Res (2024). https://doi.org/10.1007/s11356-024-33087-2
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DOI: https://doi.org/10.1007/s11356-024-33087-2