To establish a fodder base under the conditions of climate change, it is necessary to use new plants species, cultivars and hybrids, which are more resistant to droughts and high temperatures. One of these plants is the new sorghum Sudan grass hybrid 'SASM 4'. The goal of our research was to determine the dynamics of the chemical composition and nutritional value of these plants harvested in different developmental periods: stem elongation, tasselling, milk-wax and wax stage of grains, as well as the capacity of being processed into silage. It was determined that the dry matter content in the harvested green mass varied depending on the harvest time from 130.0 g/kg in the stem elongation period to 340.1 g/kg in the wax stage of grains, its chemical composition and nutritional value were: 6.53-18.40% crude protein, 2.05-3.86% crude fats, 28.62-37.61% crude cellulose, 38.90-54.84% nitrogen free extract, 7.71-10.56 % sugars, 1.43-11.94% starch, 5.25-10.22 % ash, 0.20-0.30% calcium, 0.13-0.26% phosphorus, 31.85-53.00 mg/kg carotene, 0.12-0.26 nutritive units/kg natural fodder and 1.29-2.96 MJ/kg natural fodder metabolizable energy. The fermentation quality and fodder value of silage prepared from the sorghum-Sudan grass hybrid 'SASM-4' were: pH = 4.06, 19.8 g/kg lactic acid, 6.9 g/kg acetic acid, butyric acid was not detected, 334.8 g/kg DM, 7.05% crude protein, 2.55% crude fats, 34.05% crude cellulose, 51.12% nitrogen free extract, 1.03% soluble sugars, 9.96% starch, 5.22% ash, 0.22% calcium, 0.15-0.27% phosphorus, 23.75 mg/kg carotene, 0.26 nutritive units/kg silage and 2.99 MJ/kg silage metabolizable energy.
