The study of the effect of added quantity of the essential oil of Callistemon viminalis on the in vivo digestibility of Pennisetum clandestinum and some biochemical parameters on the West African Dwarf goat was conducted with nine old West African Dwarf goats. After the adaptation period, each animal received 900 and 100 g/day of Pennisetum clandestinum hay and concentrate respectively, associated with 0, 100 or 200 mg essential oil/kg of DM. The samples of 100 g of each ration, faeces and 10 ml of urine were collected and analyzed for chemical composition and the evaluation of ingestion and digestibility. Also blood samples were obtained from jugular vein of all goats after in vivo digestibility test for the dosage of biochemical parameters. The results of this study show that the ingestion of dry matter, organic matter and the fibers were significantly (p < 0.05) higher on the goat with the ration FPc + HECv200. The digestibilities of these same components were equally higher with the ration FPc + HECv200 (71.00% and 69.00% respectively for the dry matter (DM) and organic matter (OM)). Retained (5.64 g/j) and digested (51.33) nitrogen were significantly (p < 0.05) higher with the ration FPc + HECv200. The values of blood metabolites studied increased significantly (p < 0.05) with added quantity of essential oil in the rations, except for albumin, globulin, glucose and the low-density lipoprotein (LDL). In general, the incorporation of essential oils of Callistemon viminalis in the ration improved

Objective: This study is conducted, to know the chemical composition at different periods of the dry season, of four major fodder shrubs (Albizia lebbeck, Leucaena leucocephala, Morinda lucida and Senna siamea), used to supplement poor fodders in animal feed, in the conditions of southeast Gabon. Methodology and results:The leaves of each species were harvested at the beginning, at mid-season and at the end of dry season. They were dried and crushed to determine their chemical composition. The results showed that, with A. lebbeck, the levels of DM obtained at mid-season and the end that one, were higher (P<0.05) than at the first harvest. The levels of DM and CP obtained at mid-season and the end of dry season, with L. leucocephala were higher (p<0.05) than those observed at beginning. Variations of DM and CP levels of M. lucida leaves and DM content of S. siamea leaves were not significant (p>0.05). In addition, catechic tannins were not found in the leaves of S. siamea. However, the variations of this tannins type, observed in the leaves of L. leucocephala, M. lucida and A. lebbeck were not significant (p>0.05). On the other hand, the contents of gallic tannins measured in the leaves of S. siamea decreased at the end of the dry season (p<0.05). Conclusion:Finally, it appears that these species showed few variations in protein, cellulose and tannins throughout the dry season. Taking into account the results obtained, the shrub species studied could constitute good forage in supplementation of poor grass in the dry season. However, L. leucocephala and S. siamea should be used with much moderation for the feeding of ruminants, given the presence of gallic tannins in their leaves. Nevertheless, it would be important to study the digestibility of these forages in the dry season.

clandestinum a été étudiée entre mars 2015 et mars 2016 à l'Université de Dschang. L'objet de l'étude était de contribuer à l'amélioration de la gestion d'une culture de P. clandestinum en vue d'assurer un disponible fourrager permanent en quantité et qualité optimales par le recours à la fenaison. A cet effet, un dispositif expérimental en bloc complètement randomisé comparant trois fréquences de fauche (30, 45 et 60 jours de croissance) en 8 répétitions sur des planches de 4 m 2 (2m x 2m) chacune, soit un total de 24 planches par bloc, a été utilisé pour la culture de P. clandestinum. Le fourrage a été successivement fauché à chaque fréquence durant une saison culturale. Des échantillons de fourrage ont été prélevés à chaque fauche pour l'évaluation de la biomasse tandis que le reste du fourrage a été séché au soleil pour la production du foin. Des échantillons de foin de chaque fréquence de fauche ont été analysés pour la détermination de la composition chimique. Les résultats obtenus ont montré que l'augmentation de l'intervalle de fauche (30, 45 et 60 jours) a entraîné une augmentation non significative (p>0,05) de la biomasse totale (16,10 ; 18,64 et 19,41 t MS/ha) et significative (p<0,05) de la biomasse moyenne (2,68 ; 4,66 et 6,47 t MS/ha). La composition chimique du fourrage a montré que l'augmentation de l'intervalle de fauche a eu pour effet l'augmentation significative (p<0,05) des teneurs en MS, MO, NDF, cellulose, hémicellulose et glucides totaux. La tendance inverse a été observée avec les cendres, les protéines brutes, la digestibilité de la matière organique, les matières azotées digestibles, les unités fourragères lait et viande. Enfin, la teneur en lipides la plus élevée (2,89 %) a été obtenue avec la fréquence de 45 jours. Tenant compte, à la fois, de la quantité (biomasse produite) et de la qualité (composition chimique), il ressort de cette étude que la fauche de 45 jours constitue l'option de choix d'exploitation optimale de la culture de P. clandestinum pour une fenaison.

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