Selection and evaluation of promising indigenous fodder trees and shrubs as supplemental diets for ruminant animals across different agroecological environments

Abstract

The aim of this study was to select and evaluate promising potential indigenous fodder trees and shrubs (IFTS) as supplemental feeds for  ruminant animals. Through interviews with farmers and field inventories, 107 IFTS species were identified as ruminant feeds, from  which 37 potential IFTS species were selected. The chemical composition and anti-nutritional factors of the selected IFTS were analysed.  Among the 37 selected IFTS species, crude protein (CP) ranged from 83.3 to 230.5 (mean, 134.3) g kg⁻¹ dry matter (DM); CP was greater  than 80 g kg−1 DM in all selected species. Condensed tannin (CT) content varied from 2.57 to 210.91 g kg−1 (p < 0.05) among the selected  species, of which 72% had < 40 g kg⁻¹ DM, an amount that is tolerable for ruminants. Farmers’ preferences and the nutritive value of the  selected fodder species were positively correlated (p < 0.05) for CP (0.61), organic matter digestibility (0.303) and metabolisable energy  (0.25). Farmers’ preference ranking and the nutritive value of the plants were considered to select the top 14 IFTS, all of which had CP >  110 g kg⁻¹, neutral detergent fibre (NDF) < 350 g kg⁻¹, and CT < 40 g kg⁻¹. Thus, the selected potential IFTS need further evaluation for  their agronomic practice, biomass production and animal performance.