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Revista Brasileira de Zootecnia

Print version ISSN 1516-3598On-line version ISSN 1806-9290

Abstract

ABRAHAO, José Jorge dos Santos et al. Replacing corn grain with a wet byproduct from cassava starch extraction on apparent digestibility of nutrients in beef cattle. R. Bras. Zootec. [online]. 2006, vol.35, n.4, pp.1447-1453. ISSN 1516-3598.  http://dx.doi.org/10.1590/S1516-35982006000500026.

Twenty crossbred bulls (1/2 and 3/4 Bos taurus x Bos indicus) averaging 24 months of age and 532 kg of body weight at the beginning of the experiment were used. Animals were randomly assigned to five treatments (four replicates/treatment) in a completely randomized design to evaluate the effect of replacing corn grain with a wet byproduct of cassava starch extraction on apparent digestibility of nutrients. Bulls were fed diets containing sorghum silage and one of the following levels of cassava byproduct in the concentrate: 0, 25, 50, 75 or 100%. No significant differences were observed for apparent digestibility of nutrients that averaged: 65.42% (dry matter), 68.30% (crude protein), 67.72% (ether extract), 49.58% (neutral detergent fiber), 50.71% (acid detergent fiber), and 81.79% (nonfiber carbohydrates). The contents of TDN (65.47%) and ME (2.36 Mcal/kg) also did not differ among diets. Only apparent digestibility of total carbohydrates differed across diets: Y= -0.0684N + 0.0015N2 + 63.756; R2 = 0.9122. Replacing corn grain with cassava byproduct did not change apparent digestibility of nutrients, except for total carbohydrates.

Keywords : beef cattle; cassava byproduct; digestibility; energy; feeding; feedlot.

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