Use este identificador para citar ou linkar para este item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1002582
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dc.contributor.authorSILVA, J. A. R. dapt_BR
dc.contributor.authorARAÚJO, A. A. dept_BR
dc.contributor.authorLOURENÇO JÚNIOR, J. B.pt_BR
dc.contributor.authorSANTOS, N. de F. dospt_BR
dc.contributor.authorVIANA, R. B.pt_BR
dc.contributor.authorGARCIA, A. R.pt_BR
dc.contributor.authorRONDINA, D.pt_BR
dc.contributor.authorGRISE, M. M.pt_BR
dc.date.accessioned2014-12-15T11:11:11Zpt_BR
dc.date.available2014-12-15T11:11:11Zpt_BR
dc.date.created2014-12-15pt_BR
dc.date.issued2014pt_BR
dc.identifier.citationRevista Brasileira de Zootecnia, v. 43, n. 1, p. 44-48, 2014.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1002582pt_BR
dc.descriptionThe hormonal responses of 20 female buffaloes raised under the sun (SS group) or in the shade (CS group) in Belém, Pará, Brazil, were assessed. The CS group (n = 10) was kept in a silvopasture system featuring Racosperma mangium, whereas the SS group (n = 10) was kept in paddocks without shade featuring Brachiaria humidicola, drinking water, and mineral salt. The following parameters were measured for each treatment: dry-bulb temperature (AT), relative humidity (RH), and black-globe temperature in order to calculate the globe temperature and humidity index (GTHI). Blood sample collections to quantitatively determine levels of cortisol, triiodothyronine (T3), and thyroxine (T4) were performed every 14 days, at 13.00 h. Different seasons of the year were also assessed: rainy (January-April), transition (May-July), and less rainy (August-December). Analysis of variance revealed that AT and the index of global temperature and humidity (GTHI) differed between groups; specifically, higher values were found in the SS group, which shows how important silvopastoral systems are in buffalo farming in tropical climates. Relative humidity was significantly different across seasons and particularly high in the rainy season. The treatments influenced cortisol such that higher values were observed in the SS group. The highest mean cortisol levels were recorded during the rainy and less rainy seasons, whereas the highest T3 and T4 levels were recorded only during the rainy season. Triiodothyronine and thyroxine were negatively correlated with AT and GTHI and positively correlated with RH. Silvopastoral systems provide thermal comfort to buffaloes, and the less rainy season is more likely to cause heat stress.eng
dc.language.isoengpt_BR
dc.rightsopenAccesspt_BR
dc.subjectRuminantpt_BR
dc.subjectSilvopasture systempt_BR
dc.subjectThyroid hormonept_BR
dc.titleHormonal changes in female buffaloes under shading in tropical climate of Eastern Amazon, Brazil.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2016-03-10T11:11:11Zpt_BR
dc.subject.nalthesauruscortisolpt_BR
dc.subject.nalthesaurusbioclimatologypt_BR
riaa.ainfo.id1002582pt_BR
riaa.ainfo.lastupdate2016-03-10pt_BR
dc.identifier.doihttps://doi.org/10.1590/S1516-35982014000100007eng
dc.contributor.institutionJAMILE ANDRÉA RODRIGUES DA SILVA, Universidade Federal Rural da Amazôniapt_BR
dc.contributor.institutionAIRTON ALENCAR DE ARAÚJO, UNIVERSIDADE FEDERAL RURAL DO CEÁRA/FORTALEZAeng
dc.contributor.institutionJOSÉ BRITO LOURENÇO JUNIOR, UNIVERSIDADE DO ESTADO DO PARÁ/ BELÉMeng
dc.contributor.institutionNÚBIA DE FATIMA DOS SANTOS, UNIVERSIDADE FEDERAL RURAL DA AMAZÔNIA/ BELÉMeng
dc.contributor.institutionRIANLDO VATISTA VIANA, UNIVERSIDADE FEDERAL RURAL DA AMAZÔNIA/ BELÉMeng
dc.contributor.institutionALEXANDRE ROSSETTO GARCIA, CPPSEeng
dc.contributor.institutionDAVIDE RONDINA, UNIVERSIDADE ESTADUAL DO CEARÁ/FORTALEZAeng
dc.contributor.institutionMARCIA MASCARENHAS GRISE, CPATU.eng
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