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The main animal sources used to obtain the large-scale energy consist of the waste of cattle and sheep and poultry. Theoretically, pigs and cattle and poultry are considered to have the highest capacity to produce biomass energy. In general, it is observed that animal wastes are mixed with straw and dried, used as fuel and agricultural fertilizer [39]. Biogas produced by fermentation of animal manure in an oxygen-free environment is very common in the world [40].

Especially animal solid wastes are seen as the ideal source for biogas (65% methane, 35% CO₂) production after biological treatment. The biogas obtained provides benefits as an important energy input for both electricity and heat production. If the animal wastes are released into nature without being treated, important environmental health problems such as global warming caused by methane gas, groundwater contamination and pathogenic problems occur [40, 41].