In vitro gas production and cinetical fermentation of a few local feed in Kupang East Nusa Tenggara

Research objectives were to evaluate and to analyze in vitro gas production and cinetical fermentation of Kupang's local feed. The feed materials were dried and grinded for nutrient and gas produced analysis. Collected data were chemical composition, in vitro gas production, cinetical fermentation, short chain fatty acids, energy metabolic, and organic matter digestation. The result showed that the materials have different gas production. Commonly, the higher the carbohydrate content the higher the gas production; the higher the protein and the fat content the lower the gas production. Total gas productions of each material after 96 hours incubation were 53.88 ml/0.5 g DM for the high fat content feed, 92.26 and 159.25 ml/0.5 DM for the high protein and high carbohydrate content. Regarding total production, the fermented fraction gas productions were 44.662; 82.54 and 153.462 ml/0.5 g DM. The short chain fatty acids produced were 0.31; 0.51 and 1.28 mM. The feed organic matter digestations produced were 42.2; 55.91 and 68.8 % for each feed with a high content of fat, protein, and carbohydrate. Conclusively comparing with the protein and carbohydrate feed sources, the higher the fat content the lower the gas production, short chain fatty acids, and organic matter digestion.