Impact of Waste Tea Litter on NH<sub>3</sub> and CO<sub>2</sub> Emissions during Broiler Rearing
2022
Dengfei Jie | Zhanxiang Zhang | Jincheng He | Yafang Zhou | Guangyou Zhu
Pollution generated by livestock and poultry rearing is an important environmental issue, and gas emissions during animal production are continuously increasing. A digital rearing chamber inspection system was designed in the present study in order to examine the waste tea litter’s impact on the growth performance and harmful gas emissions, such as ammonia (NH<sub>3</sub>) and carbon dioxide (CO<sub>2</sub>), during broiler rearing. Broilers were raised without litter and with waste tea litter. According to the results, broiler growth showed little difference between the two groups during the experimental period, and it was concluded that waste tea litter had no impact on broiler growth. Meanwhile, the gas emissions of the waste tea-litter group were lower than the non-bedding-materials group. In detail, the average concentrations of NH<sub>3</sub> and CO<sub>2</sub> of the non-bedding-materials group were 9.33 ± 3.65 ppm and 797 ± 107 ppm, respectively; while these concentrations in the waste-tea-litter group were 1.01 ± 0.35 ppm and 713 ± 69 ppm, respectively. According to the analysis of the litter properties, it was suggested that waste tea litter can reduce the moisture content in litter, and affect microbial and urease activity due to its low carbon nitrogen ratio (C/N), weak acid, and porous structure characteristics. In conclusion, this study showed the potential of waste tea litter in NH<sub>3</sub> and CO<sub>2</sub> emission reduction during broiler rearing.
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