This study evaluated the bromatological and histological features of native African grasses under grazing in Brazilian semi-arid rangelands. An experimental grid design was used in a randomised sampling method for four replicate samples of three African grasses. The grasses evaluated were: Cenchrus ciliaris L., Digitaria pentzii Stent. and Megathyrsus maximus (Jacq.). The bromatological and histological traits analysed included dry matter (DM), crude protein (CP), neutral detergent fibre corrected to ashes and protein (NDFap), lignin, mesophyll, vascular bundle, phloem, xylem, vascular sheath, sclerenchyma, bulliform cells, and the adaxial and abaxial epidermis. The type of grass and grazing cycle correlated with DM, NDF and lignin (p < 0.05), whereas CP was not affected by these factors (p > 0.05). Dry matter ranged between 128 and 304 g kg⁻¹; CP ranged between 90 and 167 g kg⁻¹; NDFap between 542 and 707 g kg⁻¹, and lignin between 10 and 40 g kg⁻¹. The proportion of xylem (8.4%), vascular sheath (30.5%) and total vascular bundles (38.1%) were greater in M. maximus (p < 0.05). The percentage of sclerenchyma did not differ between species (p > 0.05). Digitaria pentzii and C. ciliaris had a greater proportion of mesophyll than M. maximus (p < 0.05). Of the three grasses analysed. Digitaria pentzii exhibited the highest forage quality, because it had the lowest concentration of fibre and lignin, with lower proportions of lignified tissues.

本研究评估了在巴西半干旱牧场放牧的非洲本土草的营养学和组织学特征。采用实验网格设计对三种非洲草的四个重复样本进行随机抽样。评估的草是：Cenchrus ciliaris L.、Digitaria pentzii Stent。和Megathyrsus maximus (Jacq.)。分析的食品学和组织学性状包括干物质（DM）、粗蛋白（CP）、校正为灰分和蛋白质的中性洗涤纤维（NDFap）、木质素、叶肉、维管束、韧皮部、木质部、维管鞘、厚壁组织、泡状细胞、以及近轴和远轴表皮。草的类型和放牧周期与 DM、NDF 和木质素相关（p< 0.05)，而 CP 不受这些因素的影响 ( p > 0.05)。干物质范围在 128 至 304 g kg ^-1之间；CP范围为90至167 g kg ^-1；NDFap在542和707 g kg ^-1之间，木质素在10和40 g kg ^-1之间。木质部 (8.4%)、维管鞘 (30.5%) 和总维管束 (38.1%) 的比例在大M. maximus中较大( p < 0.05)。厚壁组织的百分比在物种之间没有差异（p > 0.05）。马唐 (Digitaria pentzii)和马唐(C. ciliaris)的叶肉比例高于马唐 ( M. maximus) ( p< 0.05）。分析的三种草中。马唐表现出最高的饲料质量，因为它的纤维和木质素浓度最低，木质化组织比例较低。