In spite of the extensive studies, information on the co-digestion of swine manure with high biogas producing poultry manure, specifically, at different ratios with a view to boosting the biogas production capability of swine manure is still sketchy. Therefore, the objectives of the study were to determine: the effect of mixture ratio (MR) of swine and chicken manures on anaerobic digestion; and MR that will produce the highest biogas yield.