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dc.contributor.authorToro-Velasquez, Paula Andrea-
dc.contributor.authorBicego, Kenia C.-
dc.contributor.authorMortola, Jacopo P.-
dc.date.accessioned2015-03-18T15:53:21Z-
dc.date.accessioned2016-10-25T20:24:51Z-
dc.date.available2015-03-18T15:53:21Z-
dc.date.available2016-10-25T20:24:51Z-
dc.date.issued2014-10-01-
dc.identifierhttp://dx.doi.org/10.1016/j.cbpa.2014.06.008-
dc.identifier.citationComparative Biochemistry And Physiology A-molecular & Integrative Physiology. New York: Elsevier Science Inc, v. 176, p. 13-19, 2014.-
dc.identifier.issn1095-6433-
dc.identifier.urihttp://hdl.handle.net/11449/116466-
dc.identifier.urihttp://acervodigital.unesp.br/handle/11449/116466-
dc.description.abstractWe investigated whether or not the preferred ambient temperature (Tapref) of the 1-day old chicken hatchling, a precocial neonate with excellent locomotory capacity, clearly identifiable thermogenesis and independence from maternal care, coincides with the lower critical temperature (LCT) of thermoneutrality and minimal oxygen consumption ((V) over dot(O2)). Tapref of single chicks measured in a thermocline (N = 16) averaged 33.5 +/- 0.3 degrees C (mode, 33.3 +/- 0.4 degrees C). The same value was obtained in hatchlings studied in pairs. LCT was computed from the ambient temperature (Ta)-(V) over dot(O2) relationship, constructed by slowly decreasing the Ta of a respirometer from 38 to 29 degrees C over 2.5 h, while continuously measuring (V) over dot(O2) by an open-flow methodology; LCT averaged 36.4 degrees C +/- 0.3 or 36.8 degrees C +/- 0.4, depending on the method of computation. In all hatchlings Tapref was lower than LCT (P < 0.001), by a magnitude that depended on the method of computation of the two variables, 2.8 degrees C +/- 0.3 (P < 0.001) or 3.9 degrees C +/- 0.5. The Tapref-LCT difference implied that, at Tapref, (V) over dot(O2) was higher than at thermoneutrality. We conclude that in the chicken hatchling thermal preference does not coincide with thermoneutrality, probably because during development what seems optimal from a thermoregulatory viewpoint may not necessarily be so for other regulatory functions. (C) 2014 Elsevier Inc All rights reserved.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)-
dc.format.extent13-19-
dc.language.isoeng-
dc.publisherElsevier B.V.-
dc.sourceWeb of Science-
dc.subjectBirden
dc.subjectNeonatal thermoregulationen
dc.subjectThermal preferenceen
dc.subjectThermoneutralityen
dc.titleChicken hatchlings prefer ambient temperatures lower than their thermoneutral zoneen
dc.typeoutro-
dc.contributor.institutionMcGill Univ-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
dc.description.affiliationMcGill Univ, Dept Physiol, Montreal, PQ H3G 1Y6, Canada-
dc.description.affiliationSao Paulo State Univ, Dept Anim Morphol & Physiol, Coll Agr & Veterinarian Sci, Jaboticabal, SP, Brazil-
dc.description.affiliationUnespSao Paulo State Univ, Dept Anim Morphol & Physiol, Coll Agr & Veterinarian Sci, Jaboticabal, SP, Brazil-
dc.identifier.doi10.1016/j.cbpa.2014.06.008-
dc.identifier.wosWOS:000341743300003-
dc.rights.accessRightsAcesso restrito-
dc.relation.ispartofComparative Biochemistry And Physiology A-molecular & Integrative Physiology-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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