Digestibility, Determination of Metabolizable Energy and Bone Mineralization of Broilers Fed with Nutritionally Valued Phytase

Fh Litz,Dv Nascimento Jr,Jms Martins,Jpr Bueno,Ns Fagundes,Ea Fernandes,Mca Silva,Acxg Carolino

doi:10.1590/1806-9061-2016-0325

Abstract

ABSTRACT The objective of this study was to evaluate the effect of using exoenzyme phytase in broiler's diets on digestibility of nutrients, feed energy and tibia bone mineralization. A completely randomized design was used, with the following treatments: sorghum with dicalcium phosphate (SDP), corn with dicalcium phosphate (CDP), sorghum with meat and bone meal (SMBM), sorghum with valued phytase (SVP) and sorghum with phytase without valued (SPWV). For digestibility analysis, eighty 15 day old broilers were used, a total of 1400 male Hubbard Flex chickens, which were submitted to total excreta collection to obtain the percentages of food digestibility, crude protein, ether extract, apparent metabolizable energy, calcium and phosphorus while for tibias mineralization. Six birds per treatment were used, where determination of mineral matter, calcium and phosphorus were performed. Metabolizable energy (ME) and apparent metabolizable energy corrected for nitrogen (AMEn) of the feed were also calculated. Data were subjected to variation analysis and the average compared by 5% Tukey test. There was no difference between treatments for the digestibility at 15-20 day old as well as for the feed energy values, but the diets with phytase had higher phosphorous percentage values for tibia bone mineralization, demonstrating that exogenous phytase enzyme is able to hydrolyze phytate origininated from plant and release the phosphorus for assimilation by animals, acting as a substitute for phosphorus plant sources.

Highlights

Several studies regarding modern poultry are developed in the areas of genetics, management and nutrition; aimed at increasing productivity and reducing production costs through the maximum development of the animals genetic potential.Adequated nutrition is based on the principle that the animal is receiving a suitable amount of nutrients such as proteins, carbohydrates, lipids, vitamins and minerals for participating of all biochemical body processes (Sechinato et al, 2006)
Supplementation of macro minerals in poultry feed is frequently modified according to the genetic improvement as well as new knowledge of the physical and chemical characteristics of the sources that influence the bioavailability of these macro minerals for the animals (Bertechini & Fassani, 2001)
Among the minerals required by poultry, phosphorus and calcium are the most important, because they are required for optimal growth rate, and for bone mineralization

Summary

Introduction

Several studies regarding modern poultry are developed in the areas of genetics, management and nutrition; aimed at increasing productivity and reducing production costs through the maximum development of the animals genetic potential. Adequated nutrition is based on the principle that the animal is receiving a suitable amount of nutrients such as proteins, carbohydrates, lipids, vitamins and minerals for participating of all biochemical body processes (Sechinato et al, 2006). Among the minerals required by poultry, phosphorus and calcium are the most important, because they are required for optimal growth rate, and for bone mineralization. Phosphorus participates of metabolic processes and nutrients absorption, besides being the most expensive mineral in the feeds final cost (Gomes et al, 2004).

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Methods

Results