Сomplexity and high price of making and using the preparation as well as its insufficient functional properties are the disadvantages of well-known functional feeds farm animals. For example, as a rule, yeast supplements for farm animals have a high cost, since relatively expensive raw materials (cake, after-alcohol bard, bran, etc.) are used for their production.

The article presents the design of the experimental device that makes it possible to obtain cost-effective whey processing, combining whey concentration with crystallization. The article gives the analysis of heat and mass transfer processes subject to the work cycle duration.