Effect of immature oak (Quercus pyrenaica) leaves intake on ruminal fermentation and adaptation of rumen microorganisms in cattle
Two experiments were conducted to study the effect of the consumption of different amounts of immature Pyrenean oak leaves (OL) by beef cattle on in vitro ruminal fermentation and potential adaptation of rumen microorganisms. A total of twelve ruminally cannulated young Brown Swiss bulls were divided in experimental groups that received different amounts of OL via the ruminal cannula (on average 0, 2.5, 5.2 and almost 10 kg fresh matter per animal and day). The gas production technique was used to study in vitro fermentation of two substrates (grass hay and OL) incubated with rumen inocula derived from each bull. Results suggest not only a dose-dependent negative effect of tannins consumption on ruminal fermentation of common feeds (e.g., grass hay), but also an adaptation of rumen microbial populations from animals receiving moderate amounts of OL. The high level of tannins in the rumen of bulls that received the highest amount of OL would have exceeded the ability of microorganisms to tolerate or detoxify them.
beef cattle in vitro gas production Pyrenean oak tannin
R.R.Doce G.Hervás F.J.Giráldez O.López-Campos A.R.Mantecón P.Frutos
Experimental Agricultural Station (CSIC) Finca Marzanas, 24346-Grulleros, León, Spain
国际会议
The 7tb International Symposium on the Nutrition of Herbivores(ISNH-7)(第七届国际草食动物营养研讨会)
北京
英文
513-518
2007-09-16（万方平台首次上网日期，不代表论文的发表时间）