Twenty livestock feed samples were analyzed for chemical composition, in-vitro gas production, gas characteristics, and in-sacco dry matter (DM) degradability. The dried and milled samples (200 mg/ 30 ml) with inoculum were incubated for 3, 6, 9, 12, 15, 21, 27, 33, 39, 48, 60, 72, and 96 h to determine the in vitro gas and methane production. For in-sacco DM degradability, 300 mg feed samples were incubated in the rumen of fistulated crossbred steers for 3, 6, 12, 24, 48, 72, and 96 h. The crude protein content ranged from 177 to 236 g/kg DM for tree and herbaceous legumes, 88.2 –139 g/kg DM for grasses, and 88 –337 g/kg DM for concentrates. The local distillery by-product (Arekeatela) had the highest neutral content (722 g/kg DM) the lowest for maize grain (204g/kg DM). The readily degradable fraction (a) of tree and herbaceous legume species was highest for Lablab (31.48%) and lowest for pigeon pea (8.6%). From concentrate ingredients, the effective DM degradability was greatest for maize grain (74.8%) and lowest for brewer spent grain (40.7%). Generally, from the study feeds from tree and herbaceous legumes, lablab, vetch, and tree lucerne, grasses desho and Guatemala, concentrate ingredients maize, oat grain, wheat bran, noug seed cake, and cotton seed cake are preferred for supplementation. However, home brewing and distilling by-products, and brewery spent grain have non-negligible values and are used for the strategic supplementation of poor-quality roughage. Further studies are needed to validate their supplementary value and levels of inclusion in animal diets.
