Time Journal of Agriculture and Veterinary Science
TJAVS Abstract -

Use of Leucaena leucocephala in ruminants’ feed in Senegal: bromatological study and digestibility

Traoré E. H*,Gaye P. A. M., C. Sall, Thomas ., Thiaw O. T., and E. Bassène

1 : Institut sénégalais de recherches agricoles/Laboratoire national de l’élevage et de recherches vétérinaires, BP 2057, Dakar ;
2 : Institut sénégalais de recherches agricoles/Centre de recherches agricoles de Saint-Louis
3 : Institut sénégalais de recherches agricoles/Centre national de recherches forestières ;
4 : Université Cheikh Anta Diop de Dakar/Faculté des sciences et techniques
5 : Université Cheikh Anta Diop de Dakar/Faculté médecine, pharmacie et ondo-staomatologie

* Corresponding author :elhadji.traore@isra.sn

Accepted :21 November,2016

To contribute to a better understanding of the use of Leucaena leucocephala in animal feed, studies on its chemical composition and degradability supplemented by dietary trials on cattle, were conducted at the National Livestock and Veterinary Research Laboratory of the Senegalese Institute of Agricultural Research (ISRA-LNERV). Results revealed fairly significant differences of CP, in order of 29.26  2.8 % and 30.07  7.10 % of DM for leaves and pods respectively. The contents levels of calcium and phosphorus were 3.25  1.50 and 0.22  0.07 % of DM, respectively. . The average contents of neutral detergent fiber (NDF) and acid detergent fiber (NDF) of the Leucaena leaves were 39.45 5.48 and 32.65 2.70%.of DM, respectively, and the acid detergent fiber (ADF) or lignocellulosic is 32.65 2.70%. A relatively low lignin level (17.02  2.70 % of DM) was obtained for the leaves. The average levels of tannins expressed as gallic acid (GA) and tannic acid (TA) in leaves and pods were less than 5% of DM and therefore could not constitute a factor limiting the digestibility of Leucaena. Indeed, nearly 80% of DM was degraded after 72 hours of incubation and over 90% of CP was degraded during the same period. The harvest season which had an influence (P <0.01 and P <0.05) on Ca, P, NDF and tannins levels variation, and induced varying (P>0.05) degradability profiles; however these were not significant. Thus, the optimum degradability rates were obtained during the rainy season.
Keywords: Food, ruminants, Leucaena leucocephala, Sahel, degradability, harvest season.