首页 | 本学科首页   官方微博 | 高级检索  
     检索      


In vitro rumen fermentation of the tropical grass Pennisetum purpureum and mixtures with browse legumes: effects of tannin contents
Authors:R Rodríguez  M Mota  C Castrillo  M Fondevila
Institution:1. Instituto de Ciencia Animal, La Habana, Cuba;2. Instituto Universitario de Investigación en Ciencias Ambientales de Aragón, Departamento de Producción Animal y Ciencia de los Alimentos, Universidad de Zaragoza, Spain
Abstract:The fermentation of Pennisetum purpureum, alone (PP) or substituted with 0.30 of the tanniferous legumes Acacia cornigera (AC), Albizia lebbekoides (AL), Leucaena leucocephala (LL) and the saponin‐rich Enterolobium cyclocarpum (EC) was studied in vitro, in presence or absence of polyethylene glycol (PEG) as tannin binder. Inactivation of tannins with PEG increased (p < 0.05) gas production with AL and LL from 8 and 12 h to the end of the incubation period respectively. When PEG was added, LL and AC promoted a higher (p < 0.05) gas volume than PP in the first 12 h incubation, and there were not differences between PP and AL. Substrate mixtures reduced (p < 0.05) methane volume produced compared with PP, but this was not related to PEG inclusion (p > 0.10). There was a trend (p = 0.06) for a higher 48 h bacterial attachment to the substrate when incubated without PEG. The decrease in fermentation of EC from 12 h incubation onwards could be associated with a negative mid‐term effect of saponins over cellulolytic bacterial activity. It is concluded that the effects of tannins on microbial fermentation of mixed forage substrates are variable, depending on their nature, but do not have a marked impact on bacterial adhesion or methane production.
Keywords:gas production  tropical legumes  tannins  saponins  Pennisetum purpureum  supplementation  methane  purine bases
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号