The cumulative biogas production (Fig. 4) showed that MRs 1:1 and 3:7 produced the highest and least quantities of biogas during the experiment. In terms of the individual manures, the average daily biogas production from MR 0:1 (0.52 L kg-1
VS fed day-1) was higher than that from MR 1:0 (0.38 L kg-1 VS fed day-1) (Table 3). This finding was in conformity with previous anaerobic digestion studies (Adewumi, 1995; Itodo and Awulu, 1999; Ojolo et al., 2007) and was attributed to high biodigestibility of poultry manure (Odeyemi, 1982). It was observed that MRs 0:1 and 1:1, which had lower digester temperatures had higher biogas production. Angelidaki and Ahring (1994) had similar observation that temperature reduction resulted in an increase of