A kinetic analysisshowed that the anaerobic digestion of poultry litter with a co-substratefollowed first order kinetics. Among the experimental reactors, R2 (25% cow dung, 75% poultry litter) gave the optimum results: aVS reduction of 51.99%, a specific gas yield of 0.469 l/g and a methane yield of 72.5%.