Nutritional attributes of a sweet corn fibrous residue
1991
Oliveira, S.P. de | Reyes, F.G.R. | Sgarbieri, V.C. | Areas, M.A. | Ramalho, A.C.
A sweet corn fibrous byproduct with 72.7% neutral detergent fiber (NDF) was chemically and nutritionally characterized. The fiber components were hemicellulose, 67.9%; cellulose 31.4%; and lignin, 0.7%. For nutritional evaluation, diets with 1.1% (group A), 5.7% (group B), and 11.5% (group C) corn fiber were used. Increasing fiber content decreased apparent protein digestibility (P < 0.05). However, the fiber content did not affect significantly the apparent biological value and the net protein utilization. Body weight gain decreased significantly (P < 0.05) in group C as compared to group A. Protein efficiency ratio, diet consumption, and diet efficiency ratio were similar among the three groups. The mean value for fiber digestibility was 47%. In another experiment the effect on the iron, calcium, zinc, and magnesium absorption by rats was tested. Increasing NDF from 1.2% to 13.1% caused a decrease of iron, calcium, zinc, and magnesium apparent absorption by 50%, 26%, 22%, and 10%, respectively.
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