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Effect of environmental temperature and broiler age on energy value of alternative feeds


Three experiments will be conducted in chambers to evaluate the effects of environmental temperature and broiler age on the energy value of sorghum, millet and soybean acid oil. In each experiment 324 male Cobb broiler chicks at the initial phase (10-14 days), 216 chickens in the growth phase (25-28 days) and 162 chickens at the final phase ( 39-42 days) will be housed in metabolic cages and divided into three chambers (hot, cold and thermoneutral). Birds will be distributed in a complete randomized design with a split-plot arrangement with six replication of six chicks each, the main plots will be the three temperatures (hot, cold and thermoneutral) and age will be the secondary plot (10 to 14, 25 to 28 and 39 to 42 days). In each phase diets will be composed of ingredient testing and reference diet. The diet test will be consisted of the following proportions: 60% of reference diet and 40% evaluated ingredient (sorghum and millet, for experiments 1 and 2, respectively) and in experiment 3 the test diet will be consisted of 90% of basal diet and 10% of soybean acid oil. Three metabolic trials will be conducted for each test ingredient in different phases of broilers life through the methodology of total feces collection. The coefficients of apparent and true metabolizability of dry matter, nitrogen, ether extract and apparent and true metabolizable energies will be calculated and energy values will be corrected for nitrogen balance. (AU)

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