FIELD: feed production. SUBSTANCE: method involves processing raw material, such as boxcalf leather production wastes, by extruding at temperature of 100-300 C under pressure of 1-40 MPa for 2-160 s. Raw material may be further comprised of sodium nitrate and/or nitrite and products of plant origin. Method allows low-cost, fully disinfected protein product of high energy value and homogeneous composition to be obtained. EFFECT: increased efficiency and improved quality of feed additive. 5 cl, 2 tbl
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