Performance and morphometry of the intestinal mucosa of laying hens fed diets containing xylanase
Souza, K. M. R. de; Faria, D. E. de; Araújo, R. B.; Sakamoto, M. I.; Santos, T. T. dos; Kikuchi, C. de G.; Nakashima, D. T.; Caetano, V. C..
R. bras. Ci. avíc.;
16(3): 241-248, July-Sept. 2014. tab
Artigo
em Inglês
| VETINDEX
| ID: vti-15859
Resumo
The objective of this study was to evaluate the effect of dietary energy level reduction and xylanase inclusion on the performance and on intestinal mucosa morphometry of two- to six-week-old laying hens. In total, 400 Hy-line W36 laying hens were distributed according to a completely randomized design in 2 x 2 factorial arrangement (energy level x inclusion of xylanase), totaling four treatments with 10 replicates of 10 birds per experimental unit. The following treatments were evaluated: positive control (balanced diet); positive control + xylanase; negative control (diet with of 100 kcal ME reduction /kg); negative control + xylanase. Body weight, weight gain, feed conversion ratio, uniformity and livability were not influenced by diets with metabolizable energy reduction and xylanase inclusion; however, the addition of xylanase to the diets resulted in shallower crypts depth and greater villus:crypt ratio in the ileum. The energy reduction of the diet associated with the supplementation of xylanase did not influence performance, but increased the feed intake of 2- to 6-week-old laying hens and increased villus height in the ileum of 6-wk-old hens. Xylanase reduces crypt depth in the ileum of 6-week-old hens.(AU)
Biblioteca responsável:
BR68.1
Localização: BR68.1
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