Journal Algérien des Régions Arides
Volume 4, Numéro 1, Pages 10-18
2005-05-01
Effect Of The Substrates Nature On Their In Vitro Fermentation Kinetics Using Rumen Fluid Of Slaughtered Dromedary As Inoculum
Authors : Bousseboua Hacène . Arhab R. . Rira M. .
Abstract
The in vitro fermentation kinetics of dates, orange and olive residues by the dromedary ruminal microflora is comparatively studied with hay used as standard. The results indicate the greater hydrolytic activity of the dromedary ruminal microflora towards dates and orange residues than olive residues and vetch-oat hay (P<0.05). The fermentation reaches the stationary phase after 24 and 48 hours for dates and orange residues, and olive wastes respectively. It is marked by two phases; corresponding to the degradation of soluble fraction (soluble sugars) and that of the insoluble one (cellulose). The results showed also that the substrate nature is a determining factor for in vitro gas production. The degradation of substrate rich in cellular content (dates and orange residues) is characterised by a fast fermentation that moves towards CO2 production, and it is marked by a long latency phase. Whereas, the fermentation of the fibrous substrate (olive residues and vetch-oat hay) generates CH4 production and it is tributary of less long latency period. The degradation level observed indicate that the dates and orange residues might represent an acceptable source of energy for dromedary, but the olive residues, in spite of their chemical composition rich in organic matter, cannot be used in animal feeding.
Keywords
dromedary, ruminal microflora, agro-industrial by-products, in vitro gas production, fermentative CO2, fermentative CH4. dromadaire, microflore ruminale, sous-produits agro-industriels, production de gaz in vitro, CO2 fermentaire, CH4 fermentaire.
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