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<p>The aim of this study was to evaluate the effect of xylanase addition (1.8&#xa0;g/kg dry matter [DM]) to tropical grass haylage used in total mixed rations (TMR) on in vitro organic matter degradability, ruminal fermentation kinetics, and methane (CH4) emission. A completely randomized design was adopted in a 4 × 2 factorial arrangement, corresponding to four tropical grass cultivars (Andropogon, Mombaça, Massai, and Marandu) with or without xylanase addition and five replications per treatment (haylage bales), totaling 40 experimental bales. Ninety days after baling, the bales were opened and used to formulate total mixed rations, which were used as substrates for the in vitro incubations, according to the experimental treatments, totaling 40 TMR units (experimental diets). Chemical composition and ruminal fermentation parameters differed among grass cultivars. TMR based on Andropogon haylage showed greater crude protein concentration and higher acetate production (<i>P</i> &lt; 0.0001), whereas Mombaça haylage promoted greater propionate production and a more favorable acetate: propionate ratio (<i>P</i> &lt; 0.0003). The addition of xylanase did not alter organic matter degradability or total gas production (<i>P</i> &gt; 0.05). However, xylanase tended to reduce CH4 emission (<i>P</i> = 0.0882) and improve CH4 efficiency (<i>P</i> = 0.0701), indicating a potential mitigation effect on enteric methane production. Diets based on Massai haylage without xylanase showed lower gas production and faster fractional fermentation rates. Overall, the results indicate that tropical grass haylage can be successfully used in TMR systems, and xylanase supplementation may contribute to improved ruminal fermentation efficiency and methane mitigation, although further studies evaluating different enzyme levels are still required.</p>

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Methane mitigation, nutritional evaluation, and in vitro degradation kinetics of diets based on tropical grass haylage treated with xylanase

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月22日

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  • Ana Beatriz de Almeida Duarte,
  • Tairon Pannunzio Dias-Silva,
  • Wesleyson Cristian Correa Viana,
  • Antonio Leandro Chaves Gurgel,
  • Marcos Jácome de Araújo,
  • Adibe Luiz Abdalla,
  • Leílson Rocha Bezerra,
  • Ricardo Loiola Edvan,
  • Romilda Rodrigues Nascimento,
  • Sheila Vilarindo de Sousa,
  • Carlo Aldrovandi Torreão Marques,
  • Luis Carlos Vinhas Ítavo,
  • Paulo de Mello Tavares de Lima

摘要

The aim of this study was to evaluate the effect of xylanase addition (1.8 g/kg dry matter [DM]) to tropical grass haylage used in total mixed rations (TMR) on in vitro organic matter degradability, ruminal fermentation kinetics, and methane (CH4) emission. A completely randomized design was adopted in a 4 × 2 factorial arrangement, corresponding to four tropical grass cultivars (Andropogon, Mombaça, Massai, and Marandu) with or without xylanase addition and five replications per treatment (haylage bales), totaling 40 experimental bales. Ninety days after baling, the bales were opened and used to formulate total mixed rations, which were used as substrates for the in vitro incubations, according to the experimental treatments, totaling 40 TMR units (experimental diets). Chemical composition and ruminal fermentation parameters differed among grass cultivars. TMR based on Andropogon haylage showed greater crude protein concentration and higher acetate production (P < 0.0001), whereas Mombaça haylage promoted greater propionate production and a more favorable acetate: propionate ratio (P < 0.0003). The addition of xylanase did not alter organic matter degradability or total gas production (P > 0.05). However, xylanase tended to reduce CH4 emission (P = 0.0882) and improve CH4 efficiency (P = 0.0701), indicating a potential mitigation effect on enteric methane production. Diets based on Massai haylage without xylanase showed lower gas production and faster fractional fermentation rates. Overall, the results indicate that tropical grass haylage can be successfully used in TMR systems, and xylanase supplementation may contribute to improved ruminal fermentation efficiency and methane mitigation, although further studies evaluating different enzyme levels are still required.