2026-07-07http://hdl.handle.net/123456789/449148The objective of this study work was to assess crude protein fractions in structural components (leaves, stem and dead material) of Coastcross grass ( Cynodon dactylon (L.) Pers) under grazing, on winter, spring and summer seasons, in the Northwestern of Paraná , South of Brazil. Were determined CP, NDF, ADF contents and protein fractions, A, B1, B2, B3 and C. Th e analysis of CP showed great differences among months, but there was no difference among seasons. NDF and ADF in the stem were lower (p < 0.05) during the spring. The season did not affect (p > 0.05) protein fractions A, B1, B2, B3 and C of leaves . However, it was observed that the highest proportions of CP were B3 and A frac tions. For the stem, the mo st important crude protein fraction is A, and it was observed that B1 fraction was lowest (p < 0.05) in the spring. Considering crude protein fractions of the Coastcross grass, in this study conditions, we can conclude that Coastcross grass presents adequate protein value for beef cattle production on pasture.application/pdfActa Scientiarum. Animal SciencesAgrocienciasartículo científico