%0 Journal Article
%T RESFRIAMENTO DA COBERTURA DE AVI¨¢RIOS E SEUS EFEITOS NA MORTALIDADE E NOS ¨ªNDICES DE CONFORTO T¨¦RMICO
%A Neiton Silva Machado
%A Ilda de F¨¢tima Ferreira Tin£¿co
%A S¨¦rgio Zolnier
%A Cristina Akemi3 Mogami
%J Nucleus
%D 2012
%I Funda??o Educacional de Ituverava
%X 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 incid¨ºncia de radia  o solar sobre a cobertura das instala  es av¨ªcolas ¨¦ um dos principais fatores que causam estresse t¨¦rmico 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 ¨¢gua de chuva, no munic¨ªpio de Rio Verde (GO). Durante o dimensionamento do sistema, foi considerado o resfriamento da cobertura a partir da aspers o de ¨¢gua armazenada durante o per¨ªodo chuvoso, sendo denominado de Sistema de Resfriamento de Cobertura Sustent¨¢vel (SRCS). Para avalia  o do sistema SRCS, foram utilizadosseis galp es comerciais, os quais foram climatizados com ventila  o for ada em modo t¨²nel (press o negativa) e sistema de resfriamento por nebuliza  o interna. Em tr¨ºs destes galp es foi implementado o resfriamento adicionalda cobertura (SRCS) e nas tr¨ºs instala  es restantes foi utilizado apenas o sistema convencional de climatiza  o (SCC) especificado anteriormente. Durante o per¨ªodo compreendido entre o 21o e o 42o dia de vidas das aves,
%K Broiler. Animal welfare. Adiabatic cooling system - Frangos de corte. Bem estar animal. Sistema de resfriamento adiab¨¢tico
%U http://www.nucleus.feituverava.com.br/index.php/nucleus/article/view/718/949