Evaluation of individual fractions of crude protein using detergent analysis takes into account the requirements of the animal on the feed nutrient compositions. This gives a broader view on the ruminants digestbility process of feeds/feed rations. To obtain good health, welfare and animal production is important to offer optimal feed ration which contains balanced components which affects feed usuability. The study describes the nutritional value of pasture vegetation. There were determined the basic chemical composition and the fractions of crude protein of forage. Fractions of crude protein have been characterized by NPN, SOLP, IP, NDIP, ADIP, A, B1, B2, B3 and C. The results of these determinations describe different representation of these fractions in various samples.
The work was statistically confirmed by the effect (P < 0.05) of the acid detergent fiber and crude fiber content of crude protein into fractions and crude protein. Among the estimated samples were found statistically significant differences (P < 0.05) for the fractions A, B2, B3, and C. Individual cuttings and harvesting years of pasture forage significantly affect the protein content and the fractions of crude protein.