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Nucleus 2012
RESFRIAMENTO DA COBERTURA DE AVIáRIOS E SEUS EFEITOS NA MORTALIDADE E NOS íNDICES DE CONFORTO TéRMICOAbstract: The high incidence of solar radiation on poultry house roof is one of the main factors that causesthermal stress on the animals. In this way, the objective of this work was to design and evaluate a cooling system that was implemented on the roof of commercial poultry houses, located in Rio Verde (GO). During the system design, it was considered the roof cooling by sprinkling water stored during the climatic rainy period, which was denoted by sustainable roof cooling system (SRCS). To evaluate the SRCS system, six commercial poultry houses were climatized with a tunnel ventilation system (negative pressure) and an internal fogging system. In three houses, additional cooling was implemented by sprinking water on the roof (SRCS) and only the conventional climatized system (CCS) was used in the three remaining houses. During the period from 21 to 42 days after the birds were hatched, three thermal comfort indexes (index of black globe temperature and humidity, radiant heat load and air specific enthalpy) and animal mortality were evaluated. The results indicated that the additional roof cooling significantly reduced bird mortality in the last week of the growth period, a fact that was considered as one of the main advantages of the system. With the obtained results, parameters of an exponential statistical model were adjusted as well, which allows to estimate animal mortality after 21 days of age, for the SRCS and CCS systems, as a function of age and air specific enthalpy.A alta incidência de radia o solar sobre a cobertura das instala es avícolas é um dos principais fatores que causam estresse térmico nos animais. Desta maneira, objetivou-se, com o presente trabalho, dimensionar e avaliar um sistema de resfriamento da cobertura de galp es comerciais para cria o de frangos de corte, com vista ao uso de água de chuva, no município de Rio Verde (GO). Durante o dimensionamento do sistema, foi considerado o resfriamento da cobertura a partir da aspers o de água armazenada durante o período chuvoso, sendo denominado de Sistema de Resfriamento de Cobertura Sustentável (SRCS). Para avalia o do sistema SRCS, foram utilizadosseis galp es comerciais, os quais foram climatizados com ventila o for ada em modo túnel (press o negativa) e sistema de resfriamento por nebuliza o interna. Em três destes galp es foi implementado o resfriamento adicionalda cobertura (SRCS) e nas três instala es restantes foi utilizado apenas o sistema convencional de climatiza o (SCC) especificado anteriormente. Durante o período compreendido entre o 21o e o 42o dia de vidas das aves,
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