Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Evaluation of nutritive value of browse tree fodder species in semi-arid Kiteto and Kongwa districts of Tanzania.

Abstract

The use of browse tree fodder as supplements to ruminant feeding in the tropics is limited by lack of information on their nutritive potential. A study was carried out based on objectives: (1) to determine chemical composition and concentration of minerals and (2) to assess in vitro digestibility potential of five foliage species of Acacia (A. mellifera, A. senegal, A. tortilis and A. xanthophloea); and Boscia spp. indigenous to Kongwa and Kiteto districts, compared to Gliricidia sepium, Leucaena pallida and Melia azedarach that are established in farmlands in the two districts aiming to fill the existing feed gap for ruminants and soil improvement purposes. Data on chemical and mineral composition were analysed for ANOVA by using SAS software. The browse tree species had high levels of crude protein (CP) that varied (P<0.05) among the species from 130 to 230 g/kg DM for A. xanthophloea and G. sepium, respectively. The species had moderate to low (P<0.05) contents of fibers which varied among the species. The NDF ranged from 342 (A. xanthophloea) to 644 g/kg DM (Boscia spp.), ADF from 184 g/kg DM (L. pallida) to 577 g/kg DM (M. azedarach) and ADL from 38 to 175 g/kg DM. The browse species had adequate levels of macro minerals ranging 2.2-12.6, 1.8-7.1, 1.4-6.4 and 1.5-3.1 g/kg DM for Ca, P, Mg and S, respectively. Concentrations of micro minerals were moderate to high (P<0.05) (4.3-53, 155-300, 13.1-80.9 and 15.2-46 mg/kg DM for Cu, Fe, Man and Zn, respectively). The species had high (P<0.05) in vitro digestibility potential 320-671 and 325-658 g/kg DM for IVOMD and IVDMD, respectively. Browse tree fodder species with enough foliage biomasses such as A. tortilis (pods), G. sepium, L. pallida and M. azedarach and in the current study could be utilized as protein supplements to ruminant livestock fed on low quality feeds including hays, stovers and crop residues due to their high levels of crude protein and minerals, low fibre contents as well as high digestibility potential.