Influence of the reduction of the levels of phosphorus in the diets with fitase on the bone characteristics of laying hens in the peak phase

• Grant number: 07/07677-5
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: January 01, 2008
• End date: September 30, 2008
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Antonio Carlos de Laurentiz
• Grantee: Victor Yamakado Pilan
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

In this work will be evaluate the bone characteristics as densitometry, resistance and mineral composition of tibia and femur of laying hens that will be obtained from acting experiment with different levels of available phosphorus in the diets for laying hens, using the enzyme fitase in the peak phase (25 to 41 weeks of age). The bone analysis will be realized in the end of the phase of the experiment with fitase, therefore, the objective of this work will be to verify the effect of the treatments supplemented with fitase about the different bone characteristics evaluated. In the experiment that is being realized and that will furnish the laying hens, the hens are being feeding with different diets distributed in a entirely casual delineation in factorial arrangement 4 x 3 (4 levels of phosphorus avaliable - Pd 0,10; 0,20; 0,30 0,40% x 3 levels of fitase 0, 500 and 1000 FTU/kg fed) with 4 repetitions of 28 chicks, totalizing 384 laying hens, with duration of four cycles of 28 days. For the bone analyses, in the end of the fourth cycle, 4 birds for treatment will be sacrificed for evaluation of the bone characteristics, being the processed data and analyzed, verifying so the bone fragility that can come to happen during the productive period. (AU)