Scholarlink

<p>Tropical grasses are widely used for silage, but their high fiber content and variable quality often limit ruminal degradation and animal performance. Strategies such as optimizing regrowth age (RA) and applying fibrolytic enzymes may help overcome these limitations, yet their combined effects remain unclear. Therefore, two experiments were carried out to evaluate whether the addition of cellulase and/or xylanase enzymes interacts with RA in mombasa grass (<i>Megathyrsus maximus</i>) and elephant grass cv. BRS Capiaçu (<i>Cenchrus purpureus</i>) to alter ruminal degradation kinetics. Mombasa and elephant grass plots were mowed and harvested at two different RA (7- and 11-wk for mombasa grass; 12- and 16-wk for elephant grass). After forages were chopped, they received one of the following treatments: no enzyme (control), xylanase enzyme (300&#xa0;mg/kg dry matter [DM]; XYL), cellulase enzyme (1&#xa0;g/kg fresh matter; CEL), and cellulase + xylanase enzymes (same dosages as before; MIX), in a factorial arrangement of 2 (regrowth ages) × 4 (enzymes) in a randomized block design, with three replicates (run). The xylanase improved the DM and neutral detergent fiber (NDF) ruminal slowly degradable fractions of elephant grass silage at 12-wk RA. However, the application of the xylanase or cellulase did not result in significant improvement in DM and NDF degradability of mombasa grass silage, although xylanase decreased the undegradable fraction. In conclusion, xylanase showed potential to enhance the degradability of elephant grass silage harvested at 12-wk RA, while 7-wk and 12-wk are recommended for improving degradability and nutritive value of mombasa and elephant grass silages, respectively. The results with the application of the combined enzymes do not justify this recommendation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ruminal degradation kinetics of mombasa and elephant grass silages as affected by fibrolyitc enzymes and regrowth ages

  • 期刊论文

  • 发表日期：

    2025年11月27日

查看全文
  • Gabriel Ferreira de Lima Cruz,
  • Odilon Gomes Pereira,
  • Wagner Sousa Alves,
  • Rafael Lelis de Freitas,
  • Edson Mauro Santos,
  • Karina Guimarães Ribeiro

摘要

Tropical grasses are widely used for silage, but their high fiber content and variable quality often limit ruminal degradation and animal performance. Strategies such as optimizing regrowth age (RA) and applying fibrolytic enzymes may help overcome these limitations, yet their combined effects remain unclear. Therefore, two experiments were carried out to evaluate whether the addition of cellulase and/or xylanase enzymes interacts with RA in mombasa grass (Megathyrsus maximus) and elephant grass cv. BRS Capiaçu (Cenchrus purpureus) to alter ruminal degradation kinetics. Mombasa and elephant grass plots were mowed and harvested at two different RA (7- and 11-wk for mombasa grass; 12- and 16-wk for elephant grass). After forages were chopped, they received one of the following treatments: no enzyme (control), xylanase enzyme (300 mg/kg dry matter [DM]; XYL), cellulase enzyme (1 g/kg fresh matter; CEL), and cellulase + xylanase enzymes (same dosages as before; MIX), in a factorial arrangement of 2 (regrowth ages) × 4 (enzymes) in a randomized block design, with three replicates (run). The xylanase improved the DM and neutral detergent fiber (NDF) ruminal slowly degradable fractions of elephant grass silage at 12-wk RA. However, the application of the xylanase or cellulase did not result in significant improvement in DM and NDF degradability of mombasa grass silage, although xylanase decreased the undegradable fraction. In conclusion, xylanase showed potential to enhance the degradability of elephant grass silage harvested at 12-wk RA, while 7-wk and 12-wk are recommended for improving degradability and nutritive value of mombasa and elephant grass silages, respectively. The results with the application of the combined enzymes do not justify this recommendation.