Abstract: It is offered the harvesting technology of shredded hay which essence is that the dried-up hay is selected from a swath; it is shredded, loaded in conveyors of facilities and ricked under a canopy. At the same time, it is provided decrease in specific operating costs in 2-2.5 times in comparison with swathed technology of harvesting of rough forages. It is developed for implementation of technology the collector - fodder shredder, consisting of a collector without racetrack, the adding reels, the screw and a hammer mill. As a result of theoretical researches there are received analytical expressions for determination: the required power of the propelling worm and under-pressing reels of the collector-fodder shredder. Reliability of the received analytical expressions is checked by pilot studies. Comparison of theoretical calculations and results of pilot studies was shown that a discrepancy of a calculated value of required power of the collector-fodder shredder with the actual values there are in limits 1.3-7.0% and this discrepancy with optimum productivities of the machinery makes only 1.3-2.0% that indicates on reliability of the received analytical expressions.