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<p>Livestock production is a major contributor to ammonia (NH<sub>3</sub>) and greenhouse gases. Brown seaweed, <i>Himanthalia elongata</i>, contains bioactive compounds such as phlorotannins, which can influence protein digestion and potentially reduce NH<sub>3</sub> emissions from excreta. However, their impact on NH<sub>3</sub> emissions from dairy slurry during storage remains largely unexplored. This study evaluates the effects of <i>H. elongata</i> and its extract on NH<sub>3</sub> emissions from slurry when included in the diet of dairy cows. Nine late lactation multiparous Holstein–Friesian cows were fed three diets (dry matter basis) for 22&#xa0;days: 1) control: 60% grass silage and 40% concentrate; 2) 4% <i>H. elongata</i>, 56% grass silage and 40% concentrate; and 3) 4% seaweed extract, 56% grass silage and 40% concentrate. Faeces and urine samples were collected separately from cows, combined at a 3:2 ratio to prepare 20&#xa0;kg of slurry, and stored for six weeks to monitor NH<sub>3</sub> emissions using the static chamber method. Cumulative NH<sub>3</sub> emissions were significantly reduced in the <i>H. elongata</i> 733.70 ± 66.46&#xa0;mg N/m<sup>2</sup>) and extract (996.71 ± 26.94&#xa0;mg N/m<sup>2</sup>) treatments compared to the control (1379.64 ± 92.76&#xa0;mg N/m<sup>2</sup>). These results highlight the potential of <i>H. elongata</i> as a sustainable solution for mitigating NH<sub>3</sub> emissions from slurry generated in dairy farming.</p>

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Mitigating ammonia emissions from dairy slurry storage by using brown seaweed in the diet for sustainable environmental management

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月1日

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  • Azadeh Dabiri,
  • Khagendra Raj Baral,
  • Tim Gilfedder,
  • John McIlroy,
  • Kayley Barnes,
  • Tianhai Yan,
  • Xianjiang Chen,
  • Maria Hayes,
  • Sharon Huws,
  • Katerina Theodoridou

摘要

Livestock production is a major contributor to ammonia (NH3) and greenhouse gases. Brown seaweed, Himanthalia elongata, contains bioactive compounds such as phlorotannins, which can influence protein digestion and potentially reduce NH3 emissions from excreta. However, their impact on NH3 emissions from dairy slurry during storage remains largely unexplored. This study evaluates the effects of H. elongata and its extract on NH3 emissions from slurry when included in the diet of dairy cows. Nine late lactation multiparous Holstein–Friesian cows were fed three diets (dry matter basis) for 22 days: 1) control: 60% grass silage and 40% concentrate; 2) 4% H. elongata, 56% grass silage and 40% concentrate; and 3) 4% seaweed extract, 56% grass silage and 40% concentrate. Faeces and urine samples were collected separately from cows, combined at a 3:2 ratio to prepare 20 kg of slurry, and stored for six weeks to monitor NH3 emissions using the static chamber method. Cumulative NH3 emissions were significantly reduced in the H. elongata 733.70 ± 66.46 mg N/m2) and extract (996.71 ± 26.94 mg N/m2) treatments compared to the control (1379.64 ± 92.76 mg N/m2). These results highlight the potential of H. elongata as a sustainable solution for mitigating NH3 emissions from slurry generated in dairy farming.