The legume family, Fabaceae Lindl., is one of the largest in the plant kingdom. Almost all species in the family form symbioses with bacteria in the family Rhizobiaceae Conn, leading to biological nitrogen fixation. Molecular nitrogen fixation is of major importance in sustainable agriculture, especially in terms of symbiosis between bacteria and legumes. This leads to the formation of special structures, plant roots are usually called nodes, where the bacterium converts atmospheric nitrogen into ammonia. Forage legumes have been suggested as important components of low input, sustainable systems for livestock production and are the basis of organic agriculture.

In the context of acute shortage protein substances in forages, which influences negatively the revitalization of the livestock sector of the Republic of Moldova, the diversification of forage production by mobilization, acclimatization and implementation of new forage legumes species from local flora and other floristic regions is necessary.

We have studied the biological peculiarities, chemical composition and nutritional value of the species Lupinus perennis L., native to western North America. The plant was once thought to deplete or wolf the mineral content of the soil; hence the genus name derived from the Latin lupus (wolf). Lupinus perennis L. were cultivated in the experimental land Botanical Garden (Institute) of the ASM, the traditional forage crop alfalfa (Medicago sativa L.) served as control variant.