<p>The article reveals the current relevance of preparation of mixed fodder mixtures with coarse and succulent fodder, as well as with feed production wastes, which are good for raising the livestock productivity. One of the important factors increasing efficiency of preparation of a feed mixture, is its preparation by a flow method, and also use of energy-efficient and resource-saving continuous feed mixers. Therefore, it is considered important to justify parameters of a lid that will meet the shape of the feed mixer chamber, as it is an essential element immediately affecting the quality of work, productivity and energy consumption of the feed mixer. These parameters are determined theoretically and practically, mathematical formulas expressing the effect of parameters and mode of operation of the working body on the productivity and power of the feed mixer and required for implementation of the technological process have been developed. According to the research findings, the time of keeping the feed mixture in the mixing chamber is 2.47 sec., the speed of the auger axis is 0.81 m/s, the productivity of the feed mixer is 15.5 tons/h. Theoretical productivity of the mixer and the required power to perform the technological process have been justified to be 7÷24 t/h and 0,45÷1,52 kW, accordingly at the volumetric mass of the feed mixture within 120÷600 kg/m3 . As per retrieved data, the use of continuous feed mixers, is being recommended for developing industrial samples.</p>