Fermentation profile and in vitro degradation parameters of silage from Urochloa species treated with cellulase and xylanase
2025
Gabriel Ferreira de Lima Cruz | Rafael Lelis de Freitas | Wagner Sousa Alves | Gabriela Duarte Oliveira Leite | Patrícia Siqueira Leite | Paulo Roberto Cecon | Odilon Gomes Pereira | Karina Guimarães Ribeiro
This study was performed to evaluate the impact of fibrolytic enzymes on the chemical composition, fermentation profile, microbial population, and in vitro dry matter (DM) and neutral detergent fibre (NDF) degradability of silage from two Urochloa species. The experiment followed a completely randomised 4 (fibrolytic enzymes) × 2 (species) factorial design with three replicates. The fibrolytic enzymes were: control (CT), cellulase (CE) (0.1% fresh matter), xylanase (XL) (400 mg/kg of DM), and a blend (CEXL) (cellulase + xylanase). The species tested were U. decumbens cv. Basilisk and U. brizantha cv. BRS Piatã. The CE treatment resulted in a lower pH and a greater lactic acid bacteria population. The CEXL treatment increased crude protein content, while CE and CEXL reduced ammonia, NDF, acid detergent fibre, and lignin levels compared with CT. The XL treatment increased the potentially soluble fraction and the DM degradation rate, while CE and the blend increased the soluble fraction of DM. Silage treated with CEXL had lower indigestible NDF, while CE increased the degradation rate. The U. brizantha exhibited a greater NDF degradability and degradation rate than U. decumbens. Therefore, CE is recommended to improve the chemical composition, fermentation profile, and degradability of Urochloa silages.
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