| Autor: |
Mendoza-Martínez GD; Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana Xochimilco, México City 04960, Mexico., Hernández-García PA; Centro Universitario Amecameca, Universidad Autónoma del Estado de México, Amecameca 56900, Mexico., Díaz-Galván C; Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana Xochimilco, México City 04960, Mexico., Razo-Ortiz PB; Centro Universitario Amecameca, Universidad Autónoma del Estado de México, Amecameca 56900, Mexico., Ojeda-Carrasco JJ; Centro Universitario Amecameca, Universidad Autónoma del Estado de México, Amecameca 56900, Mexico., Sánchez-López N; Departamento de Producción Agrícola y Animal, Universidad Autónoma Metropolitana Xochimilco, México City 04960, Mexico., de la Torre-Hernández ME; Conahcyt-UAM Xochimilco, Universidad Autónoma Metropolitana Xochimilco, México City 04960, Mexico. |
| Jazyk: |
angličtina |
| Zdroj: |
Animals : an open access journal from MDPI [Animals (Basel)] 2024 Apr 18; Vol. 14 (8). Date of Electronic Publication: 2024 Apr 18. |
| DOI: |
10.3390/ani14081215 |
| Abstrakt: |
The objective of this study was to evaluate the effects of increasing levels of the M-E complex (xylanase, glucanase, cellulase, and invertase) Optimax E ® on the performance of growing lambs, their digestibility, and their rumen microbiota, and to estimate NEm, NEg, and ruminal methane levels. Forty lambs (Katahdin x Dorset; 22.91 ± 4.16 kg) were randomly assigned to dietary concentrations of ME (0, 0.2, 0.4, and 0.8% DM) and fed individually for 77 days. Increasing M-E improved feed conversion ( p < 0.05) as well as NEm and NEg ( p < 0.05), which were associated with increased in vivo DM and NDF digestion (linear and quadratic p < 0.01). Few microbial families showed abundancy changes (Erysipelotrichaceae, Christensenellaceae, Lentisphaerae, and Clostridial Family XIII); however, the dominant phylum Bacteroidetes was linearly reduced, while Firmicutes increased ( p < 0.01), resulting in a greater Firmicutes-to-Bacteroidetes ratio. Total Entodinium showed a quadratic response ( p < 0.10), increasing its abundancy as the enzyme dose was augmented. The daily emission intensity of methane (per kg of DMI or AGD) was reduced linearly ( p < 0.01). In conclusion, adding the M-E complex Optimax E ® to growing lambs' diets improves their productive performance by acting synergistically with the rumen microbiota, modifying the Firmicutes-to-Bacteroidetes ratio toward more efficient fermentation, and shows the potential to reduce the intensity of greenhouse gas emissions from lambs. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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