Gas production technique to evaluate the nutritive value of tannin-containing shrub species from a mountain area in northern Tunisia | Technique de production du gaz pour evaluer la valeur nutritive des espèces d'arbustes contenant du tannin, d'un secteur de montagne au nord de Tunisie
2005
Ammar, H.(Departamento de Producción Animal, Universidad de León, León, (Spain)) | Boubaker, A. | Kayouli, C. | López, S.
The effect of tannins on gas production kinetics of a mixture of leaves and fine green stems of Arbutus unedo, Calicotome villosa, Erica arborea, Myrtus communis, Phillyrea angustifolia, Pistacia lentiscus and Quercus suber, harvested in spring from a grazing mountain area of the northwest of Tunisia (Nefza), was investigated. Chemical composition and kinetics of in vitro gas production measured in presence and absence of polyethylene glycol (PEG 6000) were assessed. C. villosa had the highest crude protein (CP) and the lowest cell wall and phenolic contents; while P. lentiscus showed the lowest CP and the highest cell wall and phenolic contents. PEG supply resulted in the largest increase of gas produced at 24 h (G24) with P. lentiscus (71 per cent). Foliage of tanniniferous species such as A. unedo and P. lentiscus could have a nutritive potential value as when its tannin content is inactivated by using a tannin-binding agent
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