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It was evaluated by the Cornell System carbohidrates fractions and nitrogenous compounds of the following grasses at the cutting ages of 14, 28, 42, and 56 days: nilo grass (Acroceras macrum), angola grass (Brachiaria purpurascens), aleman grass (Echinochloa polystachya), limpo grass (Hemarthria altíssima), setaria grass (Setaria anceps), tanner grass (Brachiaria arrecta), and tifton-85 grass (Cynodon spp). The experiment was carried out in a complete randomized block design, in a split plot arrangement in a way that the grasses were evaluated in the plots and the ages of cut in the split-plots. The age of cutting had an effect on the composition of the studied grasses. In most of the grasses, total carbohydrate levels, non-fibrous carbohydrates and A+B1 fraction carbohydrates increased linearly according to the age of cutting. The potentially degradable fraction of carbohydrates (fraction B2) showed a quadratic behavior according to the cutting ages for all grasses. The C fraction of the carbohydrates in tifton-85 grass linearly increased with the age but it did not increase significantly for the other grasses. In setaria grass, the intermediate levels of B2 and B3 nitrogenous fractions were high, which might represent a potential source of protein for ruminal degradation and for the small intestine. Except for setaria grass, all studied grasses show similar values of the A, B1, B2 and B3 nitrogenous fractions. Avaliaram-se pelo Sistema Cornell as frações de carboidratos e os compostos nitrogenados dos capins acroceres (Acroceras macrum), angola, (Brachiaria purpurascens), canarana (Echinochloa polystachya), hemarthria (Hemarthria altíssima), setária (Setaria anceps), tanner grass (Brachiaria arrecta) e tifton 85 (Cynodon spp) nas idades de corte de 14, 28, 42 e 56 dias. O experimento foi conduzido em blocos ao acaso em esquema de parcelas subdivididas de modo que as gramíneas foram avaliadas nas parcelas e as idades de corte, nas subparcelas. Houve efeito da idade de corte na composição dos carboidratos das gramíneas estudadas. Na maioria das gramíneas, os teores de carboidratos totais, carboidratos não-fibrosos e da fração A+B1 aumentaram linearmente conforme a idade de corte. A fração potencialmente degradável dos carboidratos (fração B2) apresentou um comportamento quadrático em função da idade, para todas gramíneas. A fração C dos carboidratos do capim-tifton 85 apresentou aumento de forma linear com a idade, mas não aumentou de forma significativa para as demais gramíneas. No capim-setária, os teores médios das frações nitrogenadas B2 e B3 foram elevados, o que pode representar um bom aporte protéico para degradação ruminal e para o intestino delgado. Todas as gramíneas avaliadas, à exceção do capim-setária, apresentam valores similares das frações nitrogenadas A, B1, B2 e B3

Fractions of carbohydrates and of nitrogenous compounds of tropical grasses at different cutting ages