Comparative studies on the degradation and mean retention time of solid and liquid phases in the forestomachs of dromedaries and sheep fed on low-quality roughages from Tunisia
Identifieur interne : 000441 ( France/Analysis ); précédent : 000440; suivant : 000442Comparative studies on the degradation and mean retention time of solid and liquid phases in the forestomachs of dromedaries and sheep fed on low-quality roughages from Tunisia
Auteurs : C. Kayouli [Tunisie] ; J. P. Jouany [France] ; D. I. Demeyer [Belgique] ; D. I. Ali-Ali [Tunisie] ; H. Taoueb [Tunisie] ; C. Dardillat [France]Source :
- Animal Feed Science and Technology [ 0377-8401 ] ; 1993.
Abstract
The digestion of the acid detergent fiber (ADF) fraction of vetch-oat hay was studied in two dromedaries and three sheep, all rumen-fistulated and fed vetch-oat hay with a concentrate. Dromedaries and sheep consumed similar amounts of feed dry matter (DM) per kilogram of metabolic weight, but dromedaries drank less water than sheep. There were no differences in the volatile fatty acid (VFA) and ammonia concentrations in the rumen between dromedaries and sheep, but pH was higher in the dromedaries than in the sheep (P < 0.05). The mixture of VFA contained more propionate and butyrate and less acetate in dromedaries than in sheep (P < 0.05). The protozoal concentration was higher in the rumen of sheep than of dromedaries. This result was consistent with the higher NNH3, concentration in sheep. Entodinium was the most abundant species in both dromedaries and sheep. Specific rates of rumen liquid (PEG) and particle (chromium-mordanted hay) outflow were higher and lower, respectively, in dromedaries than in sheep. Also, dromedaries had higher in sacco, in vitro, and fecal digestibilities of vetch-oat hay dry matter (DM) and ADF than sheep. In sacco, the potential degradable fraction was higher, but the rate of degradation was not. The greater utilization of ADF in the rumen by dromedaries is discussed in relation to the higher cellulolytic activity of the rumen microorganisms, the longer retention time of feed particles and/or the greater buffering capacity of the rumen contents of the dromedary against fermentation acids.
Url:
DOI: 10.1016/0377-8401(93)90063-P
Affiliations:
- Belgique, France, Tunisie
- Auvergne (région administrative), Auvergne-Rhône-Alpes, Gouvernorat de Tunis
- Saint-Genès Champanelle, Tunis
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ISTEX:A9DBF6FC9A04F246649AE55217524394E4DEC213Le document en format XML
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