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dc.contributor.authorVale, MM-
dc.contributor.authorMoura, DJ-
dc.contributor.authorNääs, IA-
dc.contributor.authorPereira, DF-
dc.identifier.citationRevista Brasileira de Ciência Avícola. Fundação APINCO de Ciência e Tecnologia Avícolas, v. 12, n. 4, p. 279-285, 2010.-
dc.description.abstractClimate may affect broiler production, especially where there are heat waves, which may cause high mortality rates due to the heat stress. Heat wave prediction and characterization may allow early mitigation actions to be taken. Data Mining is one of the tools used for such a characterization, particularly when a large number of variables is involved. The objective of this study was to classify heat waves that promote broiler chicken mortality in poultry houses equipped with minimal environmental control. A single day of heat, a heat-shock day, is capable of producing high broiler mortality. In poultry houses equipped with fans and evaporative cooling, the characterization of heat waves affecting broiler mortality between 29 days of age and market age presented 89.34% Model Accuracy and 0.73 Class Precision for high mortality. There was no influence on high mortality (HM) of birds between 29 and 31 days of age. Maximum temperature humidity index (THI) above 30.6 ºC was the main characteristic of days when there was a heat wave, causing high mortality in broilers older than 31 days. The high mortality of broilers between 31 and 40 days of age occurred when maximum THI was above 30.6 ºC and maximum temperature of the day was above 34.4 ºC. There were two main causes of high mortality of broilers older than 40 days: 1) maximum THI above 30.6 ºC and minimum THI equal or lower than 15.5 ºC; 2) maximum THI above 30.6 ºC, minimum THI lower than 15.5 ºC, and the time of maximum temperature later than 15:00h. The heat wave influence on broiler mortality lasted an average of 2.7 days.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
dc.publisherFundação APINCO de Ciência e Tecnologia Avícolas-
dc.subjectHeat shock dayen
dc.subjectheat waveen
dc.subjectproductivity lossesen
dc.titleCharacterization of heat waves affecting mortality rates of broilers between 29 days and market ageen
dc.contributor.institutionUniversidade Federal de Santa Maria (UFSM)-
dc.contributor.institutionUniversidade Estadual de Campinas (UNICAMP)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationUFSM Departamento de Zootecnia-
dc.description.affiliationUNICAMP FEAGRI-
dc.description.affiliationUniversidade Estadual Paulista Campus de Tupã-
dc.description.affiliationUnespUniversidade Estadual Paulista Campus de Tupã-
dc.rights.accessRightsAcesso aberto-
dc.relation.ispartofRevista Brasileira de Ciência Avícola-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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