Efeitos de níveis crescentes de fibra em detergente neutro na dieta sobre a fermentação e digestão ruminal em bubalinos e bovinos. / Effects of the increasing levels of neutral detergent fiber in the diet on the ruminal fermentation and digestion in water buffaloes and cattle.

AUTOR(ES)
DATA DE PUBLICAÇÃO

1999

RESUMO

Four buffaloes and four cattle rumen fistulated, were used to study the effects of different levels of neutral detergent fiber in the diet on the rumen fermentation and digestion. In situ degradability assay was make of dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) of the Coast-Cross hay (Cynodon dactylon) and the concentrate mixture; digestibility with marker (Cr2O3); ammonia concentration, production of volatile fatty acids (acetic, propionic and butyric) and pH in the ruminal liquid. The animals were designed in two Latin Square experiment (4x4). Treatments were applied in factorial 4 x 2 with four rations with increasing levels of NDF (54, 60, 66 and 72%) and two animal species (buffaloes and cattle). Twenty-nine days subperiods were used, the first thirteen for diet s adaptation. A significant effect was observed (P<0,01) in the species on the ruminal pH, with average of 6.78 in buffaloes and of 6.58 in cattle. There was effect of the interaction time x species, in the rumen ammonia concentration only at 2 hours after feeding with buffaloes having mean of 31.76 mg% and cattle 27.74 mg%. Buffaloes had lower (P<0,05) concentration of volatile fatty acids, acid acetic and acid butyric (69.94 mM, 51.31 mM and 6.12 mM) than cattle (77.96 mM, 56.72 mM and 8.01 mM). There was no significant difference (P>0,05) acid propionic concentration and acetic:propionic relation. The buffaloes showed higher ruminal disappearance of DM and NDF of the Coast-cross hay and DM and CP of the soybean meal than the cattle, in most of the times of incubation. The ruminal disappearance of CP of Coast-cross hay went higher for the buffaloes only in the last hours of incubation. On the other hand, the ruminal disappearance of NDF of wheat bran went higher for the cattle only in the first hours. There was interaction of species with levels of NDF for digestibility coefficient of the DM. The digestibility coefficient of NDF was only influenced by the levels of NDF. The digestibility coefficient of CP wasn t noticed effects of species or levels of NDF.

ASSUNTO(S)

neutral detergent fiber buffalo bovino digestion fibra em detergente neutro digestão ruminal fermentation cattle fermentação ruminal bubalino

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