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Evaluation of Different Minimum Ventilation Systems on Air Quality and Performance of Broilers in the Period of Fifteen to Twenty-One Days of Housing

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009239.(doi:10.13031/2013.29835)
Authors:   Irene Menegali, Ilda de Fátima Ferreira Tinôco, Cecília de Fátima Souza, Keller Sullivan Oliveira Rocha, Maria Clara de Carvalho Guimarães
Keywords:   Keywords: minimal ventilation, air quality, broiler chicken; ventilation system

The objective of this work was to evaluate the efficiency of different minimal ventilation systems (controlled by timing devices) including positive pressure ventilation (SVMP), negative pressure ventilation (SVMN) and natural ventilation (SVMNat), associated to the thermal comfort environment, air quality and the influence of these factors on the productive performance of broiler chicken during the finishing stage of heating. The study was developed in a commercial poultry house integrated during the winter in the Minas Gerais State. Three points along the length of the building, as well as two points along the height of the building for verification of different environmental variables, air temperature, black globe temperature, relative humidity and air velocity at the level of bird and worker respiration. Ammonia, carbon monoxide and oxygen concentrations were verified at the times of 3, 9 15 and 21 h. No statistical difference (P<0.05) was observed for the variable bulb globe temperature index (ITGU). Average ITGU were below comfort levels for the birds, exposing them to cold stress in the majority of the time for the three minimal ventilation systems, indicating probable deficiencies in the heating systems and/or the insulation system for hatchlings in their initial growth phase. Average pollutant gas measurements did not surpass tolerable levels for the three minimal ventilation systems evaluated at the level of the broilers and workers. However, minimal ventilation systems were adequately dimensioned in terms of minimal air renewal, presenting no negative influences in relation to ventilation rates applied for the systems SVMN and SVMP.

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