Evaluation of pollution potential in swine manure across growth stages: Impact 2025 of dietary nutrients and management strategies

Abass, Olusegun K. and Hongyong, Fan and Chenghao, Li and Chaoxiang, Liu and Wenxuan, Zhang and Lin, Liu and Xu, Huang and Yingjie, Sun and Huawei, Wang and Maureen, W. Gesiye Evaluation of pollution potential in swine manure across growth stages: Impact 2025 of dietary nutrients and management strategies. Science of The Total Environment.

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Abstract

Regulation of dietary nutrient fractions to control the release of labile manure pollutants in swine production remains a challenge. Feeding trials were conducted to assess the impact of dietary nutrient fractions on labile manure composition and pollution potential in pigs at different growth stages. The pigs were selected based on age (weaning = 60 days, feeding = 100 days, and finishing = 160 days), health, and average body weight (23.7 kg, 50.5 kg, and 109.0 kg respectively) and fed with (1) high, (2) medium, and (3) low energy diets twice daily in all three growth stages. Urine and feces were collected for analysis. The study utilized correlation, nutrient balance analysis, and theoretical models to evaluate the dietary impact on nutrient distribution and pollution potential. Results showed higher nutrient retention (N, P, Cu, Zn) with the high-energy diet across all growth stages compared to the other two diet energy levels. Correlation analysis revealed that pigs' weight gain does not reflect dietary efficiency nor indicate lower pollution potential from nutrient retention. However, dietary nutrient fractions played more significant role in labile manure release compare to the total manure component. Overall, the dietary regulatory approach offers a sustainable strategy to mitigate environmental pollution while supporting nutrient recycling using manure with lower pollutant loads.

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