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The study was conducted to determine the pattern of organic matter degradability, volatile fatty acid concentration, estimated methane and microbial protein products of napier grass and fruit peels when fermented in the rumen. In vitro method was used to determine the pattern of these end-products. Five experimental samples were randomly assigned to five treatments with one sample per treatment in a completely randomized design. The compared experimental samples were napier grass (NG), orange peel (OP), pawpaw peel (PPL), mango peel (MP) and plantain peel (PP). Results obtained showed that parameters observed under in vitro gas production characteristics, organic matter degradation, volatile fatty acids concentration, estimated methane and microbial protein products were significantly (P<0.05) affected with the exception of intercept (a) and gas production rate constant for the insoluble fraction (b) (P<0.05). The incubation time (t 1 /2) (18.00hr), acetate (74.42%) and methane (38.00mmol) were significantly (P<0.05) highest for NG. Gas production from the insoluble but degradable fraction (58.98ml), potential gas production (62.00ml) and propionate (13.42%) were significantly (P<0.05) higher for PPL whereas organic matter degraded (42.01mg), volatile fatty acid concentration (72.75 mmol/litre), butyrate (10.20%) and microbial protein (2393g) were better for MP. It was concluded that MP and PP have the potentials to improve rumen fermentation efficiency and reduce methane gas.

iosr journal of agriculture and veterinary science

Comparison of Fermentation Kinetics (in vitro) of Napier Grass and Fruit Peels for Ruminants: The Pattern of Organic Matter Degradability, Volatile Fatty Acids Concentration, Estimated Methane and Microbial Biomass Production