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Determination of energy and proteins requirements by factorial method to broiler breeder hens, laying hens and broilers

Abstract

Determination of energy and proteins requirements by factorial method to broiler breeder hens, laying hens and broilers. The project aims at carrying out many assays in order to determine prediction equations of energy and protein requirements to laying hens, broiler breeder hens of growth and production and broilers. The prediction equations will be determined by factorial method, that divide the demand into maintenance, growth, weight gain and production. The requirements poultry s for maintenance will be determined by comparative slaughtering technique. To verify the temperature effect on energy for maintenance the assays will be conducted on three different temperatures, 15, 23 and 30°C, in a chamber house with controlled temperature. The maintenance determination will be based on quantification of ingested and retained energy at four different levels of ingested food, which related by regression equation of energy retention in function of ingestion of energy, the estimate of the energy demands to maintenance as being the x axis intercept will be provided. The demands for protein to maintenance will be determined through metabolism assays, that will be determined by nitrogen balance, the nitrogen retention at different levels of ingested food. The regression of retention of nitrogen in relation to ingested food will provide the nutrient demand to maintenance as being the x axis intercept (nitrogen ingestion). The demand of nitrogen multiplied by conversion factor of nitrogen in proteins will provide the protein requirements. To determine the energy and protein demand for weight gain and egg production the rate of energy and protein retained on weight gain and egg production will be quantified and the efficiency of deposition on carcass and eggs will be considered. From energy and protein values determined to maintenance with correction to temperature, weight gain and production, prediction equations of daily requirements of energy and protein will be established. Later these equations will be tested in performance assays of laying hens, broiler breeder hens, and broilers, to verify their validity and application on elaboration of nutritional requirements tables for energy and protein. (AU)