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The cation exchange capacity (CTC) of neutral detergent fiber (FDN) from samples of rye grass (Az) and lucerne (AL) hays, corn (Mi), soybean meal (FS) and wheat bran (FT) was evaluated by the original method developed by McBURNEY et al . (1983) and by modified technique of this method, with six replicates for each material and method. The modified method consisted in the determination of the physico-chemical property in the residue from FDN determination, instead of to separate a large quantity of fiber for subsequent CTC evaluation. It has been found that with the modified method higher values were found than the ones displayed by the original method, but the same classification has been observed among the studied materials (P Mi>AZ=AL=FT. Correlation between methods was high, with r=0.9877 (P<0.01). On the other hand, the proposed modification saves time and reagents showing to be as efficient as the original method.

MODIFICAÇÃO DE TÉCNICA DE DETERMINAÇÃO DA CAPACIDADE DE TROCA CATIÔNICA DA FIBRA EM DETERGENTE NEUTRO DE ALIMENTOS