A comparative study of biogas production of different proportions of poultry wastes and cow dung was conducted
under the same operating conditions. The study was based on Completely Randomsied Design replicated three times. Three
different mix ratios of poultry wastes and cow dung were tested (namely 3:1, 1:1 and 1:3) and all of them were diluted with the
same amount of water. Each treatment was replicated three times. Biogas production was measured for a period of seven
days and volume of gas produced was determined by water displacement method at room temperature of 25 – 30oC. Biogas
production started on the second day, and reached apex on the sixth day for Digester A (cow dung:poultry wastes r = 1:3).
Production reached its peak on the seventh day for Digester B (cow dung:poultry wastes r = 2:2). For Digester C (cow
dung:poultry wastes r = 3:1), biogas production started on the second day and attained maximum on fifth day. The average
gas production for Digesters A, B and C were 3.84, 3.55, and 3.19 mL respectively. The study shows that the largest volume
of biogas production was obtained using the 3:1 mix ratio of poultry wastes to cow dung. Poultry wastes therefore are
effective for production of biogas than cow dung. Statistical analysis reveals that wastes fed into the digester and days of
experiment were significant at 99% confidence level. The volumes of wastes generated by the digesters were statistically
different from each other. Digester A produced the highest mean biogas of 4.48 mL/day and this value was significantly
higher than ones produced by Digesters B and C (4.26 and 3.72 mL/day respectively). Finaly, for a developing country like
Nigeria, where wastes are not productively used, wastes generated from animal wastes can be effectively managed through
conversion into biogas. Wastes are therefore turned to wealth, which increases the income of the society.