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

Revista Brasileira de Zootecnia

Silva, José Fernando Coelho da²  Silva, Martinho de Almeida e¹  Vittori, Andréa³  Vásquez, Hernán Maldonado²  Campos, Patrícia Regina de Souza Siqueira² 

[1] Universidade Federal de Minas Gerais;Universidade Estadual do Norte Fluminense;Faculdade Filadélfia

关键词: chemical composition;    Cornell system;    forage;    neutral detergent fiber;    protein RESUMOAvaliaram-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;   

DOI  :  10.1590/S1516-35982010000700021

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

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.

【 授权许可】

CC BY-NC