Dietary levels of zinc and manganese on performance, digestibility and bone mineralization of broiler chickens

• Grant number: 12/04481-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: May 01, 2012
• End date: April 30, 2013
• Field of knowledge: Agronomical Sciences - Animal Husbandry - Animal Nutrition and Feeding
• Principal Investigator: Douglas Emygdio de Faria
• Grantee: Paulo Takeshi Bravo
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil

Abstract

Two experiments will be conducted to determine the concentration of zinc and manganese in the diet of broilers on performance characteristics (weight gain, feed intake, feed conversion and mortality), digestibility and bone mineralization and to compare methods to quantify the degree of bone mineralization. Be certain the ashes of the tibia, tarsal-metatarsal and phalanges, and only in the tibia will be comparing the technique with and without lipid extraction. In each of the experiments will be distributed 320 chicks in a completely randomized design with eight treatments and five replications, and the experimental unit consists of eight birds. The experiment will start with one day of age and the birds slaughtered at 42 days. The difference between the first and second experiment is related to the trace element to be evaluated, and zinc and manganese, respectively. In experiment 1, inclusion levels of zinc sulphate will be 0, 60 and 100ppm and zinc and methionine for 20, 40, 60, 80 and 100ppm. In experiment 2, inclusion levels of manganese sulfate are 0, 65 and 105ppm and manganese and methionine 25, 45, 65, 85 and 105ppm. In both experiments, to determine the availability, will be compared a diet without addition of trace mineral with other diets with the addition of trace element in the organic and inorganic. To determine the requirement, only the levels of trace minerals in organic form will be compared. The diets are formulated based on corn and soybean meal and meet the levels established by Rostagno et al. (2005). The comparison between organic and inorganic minerals will be submitted to the test F. The data will be subjected to analysis of variance with the aid of the statistical program SAS (2004) and the average will be submitted to the Tukey test at 5%probability. (AU)