Țîței, Victor2026-10-302026-10-3020252069-6727https://repository.iuls.ro/handle/20.500.12811/7202The goal of this research was to determine the quality indices of harvested green mass and hay from the local ecotype of the perennial leguminous species, fine-leaf vetch (Vicia tenuifolia), maintained in monoculture in the experimental plot of the NBGI MSU Chişinău. The biochemical composition and nutritive value of the dry matter of the harvested green mass were as follows: 200 g/kg CP, 118 g/kg ash, 305 g/kg CF, 313 g/kg ADF, 488 g/kg NDF, 44 g/kg ADL, and 95 g/kg TSS, with 65.1% DMD, 12.79 MJ/kg DE, 10.50 MJ/kg ME, and 6.52 MJ/kg NEl. The studied fine-leaf vetch hay contained: 195 g/kg CP, 121 g/kg ash, 309 g/kg CF, 331 g/kg ADF, 505 g/kg NDF, 48 g/kg ADL, and 78 g/kg TSS, with 63.1% DMD, 12.43 MJ/kg DE, 10.21 MJ/kg ME, and 6.22 MJ/kg NEl. The studied substrates for biogas production had a favourable carbon-to-nitrogen ratio (C/N = 14–18), and the estimated biomethane potential varied from 343 to 350 l/kg organic dry matter. The results indicate the potential use of the harvested green mass and prepared hay from the local ecotype of Vicia tenuifolia as feed for livestock, as well as substrates in biogas reactors for biomethane production as a renewable energy source.enbiochemical compositionbiomethane potentialfeed valuegreen masshayVicia tenuifoliaArticle