The effects of supplementary bacterial phytase on dietary true metabiolisable energy, nutrient digestibility and endogenous losses in precision fed turkeysReportar como inadecuado




The effects of supplementary bacterial phytase on dietary true metabiolisable energy, nutrient digestibility and endogenous losses in precision fed turkeys - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

* Corresponding author 1 SAC

Abstract : ABSTRACT 1. Forty BUT 9 female turkeys were used in a precision feeding assay to investigate the effect of dietary phytase on true metabolisable energy corrected for N retention TMEn, true nutrient digestibility TND, and the excretion of endogenous mucin, measured as sialic acid SA. 2. Five treatments control C, C + 250 FTU phytase units per kg feed, C +500 FTU, C +2500 FTU, and glucose only for endogenous losses estimation were used in this study and each treatment was replicated eight times in a randomised complete block design. Diets were formulated to be nutritionally adequate with the exception that the P content was relatively low 3.6 g-kg non-phytate P. 3. Inclusion of phytase increased TND in a quadratic manner with the optimum being achieved at approximately 500 FTU, at which TND was 37.3% improved compared to the control. The concentration of SA in the excreta decreased linearly P0.05 by phytase supplementation. 4. Phytase inclusion increased digestibility coefficients for indispensable, dispensable and total amino acids in a linear manner. The scale of the response to phytase was greatest with threonine least with lysine digestibility, suggesting a specific mechanism of action that benefits the gut health. 5. The strong negative relationship between secretion of SA and threonine digestibility suggests that a large part of the threonine benefit may be from reduced mucin synthesis. This supports the hypothesis that dietary phytase may play a role in improving the health status of the intestine and as a result reducing the maintenance energy requirements of turkeys.

Mots-clés : Life Sciences





Autor: Vasil Pirgozliev -

Fuente: https://hal.archives-ouvertes.fr/



DESCARGAR PDF




Documentos relacionados