In vitro degradation kinetics of four varieties of Panicum maximum at four crop growth stages

We evaluated the in vitro degradation of dry matter (DS) from leaves, stems and whole plants of four varieties of guinea grass (Panicum maximum; common names: Tanganyika grass and buffalograss) at four crop growth stages (21, 42, 63 y 84 days). We assessed the chemical composition of the four varieties. For in vitro digestibility, we used the first phase of the Tilley and Terry techniques, which required the extraction of rumen fluid from two cannulated Brown Swiss cows. Six incubation periods (3, 6, 12, 24, 48 y 72 hours) were evaluated. For in vitro degradation kinetics, we used the randomized complete block design (RCB), using run 2 as a block and replication. We used a Daisy II 200 incubator and one bag per run. It was found that the highest level of in vitro degradation are present during initial phenological stages, and that leaves contain superior nutritional characteristics, followed by the whole plant and stems. It was demonstrated that the differences in degradation are not strongly linked to varieties of Panicum maximum but to crop growth stage. It was concluded that in vitro biodegradability of the four varieties of guinea grass vary according to plant growth.

• Autor Principal: Avellaneda Cevallos, Juan Humberto (author)
• Outros autores: Molina Hidrovo, Carlos Alberto (author), Briones Caicedo, Wilson Roberto (author), Tubay Moreira, Máximo Fernando (author), Coello Díaz, Santiago (author)
• Formato: article
• Idioma: spa
• Publicado: 2015
• Subjects: Madurez; digestibilidad; forraje; fenología; rebrote; Maturity; digestibility; fodder; phenology; regrowth
• Acceso en liña: https://revistasespam.espam.edu.ec/index.php/Revista_ESPAMCIENCIA/article/view/96