EN
During three years of experiments the crops and chemical composition of brome grass, cocksfoot-grass and Italian rye-grass were tested - before heading /30-40 cm/, at the beginning of heading and at the beginning of flowering. The teras of harvesting effected the grass crop, the chemical composition and the nutritive value of green forage. The best crop was moved at the beginning of heading. During grass vegetation in spring the protein and sugar content of green forage was reduced while the fibre, ADF and lignin /grass of 30-40 cm/ content was growing. The variations of grass chemical composition of the second and the third growth were not very distinct. The heading was the best term of the first grass harvesting.