Currently, agriculture is an intensively developing industry. To provide the population with meat, milk, and wool, the volume of livestock products is increasing, which entails the development of forage production. The development of feed production is possible by improving the quality of products and reducing the cost of feed production. The quality can be improved by using the extrusion method, which increases the digestibility and nutritional value of feed. The addition of sapropel provides animals with vitamins and minerals. As a result of the scientific and economic experiments conducted on broiler chickens, it was found that birds that were fed with extruded sapropele grain had a greater weight gain. For the production of extruded sapropelic feed, an extruder with a double-entry screw and conical compression rings can be used. It can reduce extrusion losses and the screw length. To determine the design parameters, it is necessary to develop a mathematical model of the pressure change in the extruder along the screw length. Having analyzed the mixture movement through the annular conical channel of the die and built an equilibrium equation for the elementary section, we have a mathematical model for determining the pressure in front of the forming head. In a similar way, a mathematical model was built to determine the pressing pressure in front of the compression seal. The paper describes mathematical relationships for determining the pressure at any point in the extruder. Using the mathematical relationships, design parameters that affect the pressure in the extruder have been determined.

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