FIELD: biotechnology and waste disposal. SUBSTANCE: excrement is diluted, solid fraction separated, liquid fraction fermented, and biomass obtained is dried and disinfected. The first operation involves culture liquid obtained from fermentation step and, according to invention, is conducted continuously in cyclic mode until specified content of solid substance is attained. Solid fraction is settled down, filtered out in vacuum, granulated, and dried to yield carbon- protein compound feed additive, while filtrate is converted into fowl biostimulant. Several types of feed additive can be produced. EFFECT: improved environmental condition and useful products obtained. 2 tbl
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