The nitrogen content was determined in acid-detergent fiber (ADF) isolated from awnless rump, meadow fescue and meadow timothy, depending on the phase of their the same phases are for silage and haylage. Samples for analyzes were dried at a temperature of 60-65 ° C. As the grasses grew, an increase in the content of CDC in them was observed, which was also accompanied by an increase in ADF from the phase of entering the tube to flowering in timothy grass - from 1.18 to 1.36%, in meadow fescue - from 0.96 to 1.58 5%. When preserving grasses, an increase in the content of CDC is observed in all phases of their growth as compared to the original grass, but the mass fraction of ADF in the dry matter of silage and haylage was no more than in the original grass. If the technology of harvesting silage and haylage is observed, the level of thermal damage to these forages does not increase. With the growth of grasses from the vegetative phase to flowering, the content of SP in grasses and forages from them decreases, while the proportion of ADF in it increases. The inverse relationship between these indicators had correlation coefficients of 0.83, 0.88 and 0.92 for grasses, silage and haylage, respectively. The need to harvest them in earlier phases of growth is noted.

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