Teores de proteína bruta para bovinos alimentados com feno de tifton 85: consumo e digestibilidades total e parcial
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Data
2008
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Resumo
Eight crossbred steers fitted with ruminal and duodenal cannulas were randomly assigned to two replicated
4 x 4 Latin squares to evaluate the effects of crude protein (CP) levels on intake and total, ruminal and intestinal digestibility
of nutrients. Animals were fed a control diet containing Tifton 85 bermudagrass hay or the control diet supplemented with
urea (NPN diet), soybean meal (SBM diet) or corn gluten meal-60 (CGM diet). Indigestible acid detergent fiber was used
as the internal marker for measuring duodenal flow of dry matter, ruminal and intestinal digestibility, and fecal output of
nutrients. Total fecal collection was used to determine total tract digestibility of nutrients. Nutrient intakes (DM, OM, CP,
TC, NDF, ADF, and GE) did not differ among diets. However, apparent total tract digestibility of acid detergent fiber was
greater on CGM (55.48%) than on SBM diet (41.29%). Except for CP, ruminal digestibilities of all remaining nutrients
were similar across diets. Intestinal digestibility of CP on SBM (66.70%) and CGM diets (80.25%) were higher than that
on the NPN diet (57.61%). It can be concluded that supplementation with different protein sources did not change intake
(except for CP and nonfiber carbohydrates) and the partial digestibility of nutrients (except for CP).
Descrição
Palavras-chave
Farelo de glúten de milho - 60, Farelo de soja, Fluxo duodenal, Fibra em detergente ácido indigestível, Uréia, Corn gluten meal, Duodenal flow, Indigestible acid detergent fiber, Soybean meal, Urea
Citação
SILVA, Edilane Aparecida da; BERCHIELLI, Telma Teresinha; REIS, Ricardo Andrade; FERNANDES, Juliano José de Resende; SATO, Kátia Junko; PAES, José Mauro Valente. Teores de proteína bruta para bovinos alimentados com feno de tifton 85: consumo e digestibilidades total e parcial. Revista Brasileira de Zootecnia, Viçosa, v. 36, n. 1, p. 237-245, 2007.