Thermogenesis, vocalization, and temperature preference of 1-day-old chicken hatchlings after cold-exposure in late embryogenesis
dc.contributor.author | Toro-Velasquez, Paula Andrea [UNESP] | |
dc.contributor.author | Mortola, Jacopo P. | |
dc.contributor.institution | McGill Univ | |
dc.contributor.institution | Universidade Estadual Paulista (Unesp) | |
dc.date.accessioned | 2014-12-03T13:11:30Z | |
dc.date.available | 2014-12-03T13:11:30Z | |
dc.date.issued | 2014-07-01 | |
dc.description.abstract | In a thermal gradient the preferred ambient temperature (T (a) pref) of chicken hatchlings is a few degrees lower than thermoneutrality. To investigate whether a correlation may exist between T (a) pref and the autonomic thermogenic capacity or not we studied a group of hatchlings (N = 15) exposed to cold at end-incubation, a procedure known to increase their postnatal thermogenesis. Chicken embryos were exposed to cold (34.5 A degrees C instead of 38 A degrees C) at days 18-20 of incubation. By comparison to Controls (N = 15), they hatched a few hours later, with similar body weight, body temperature, vocalization (number of sounds produced per unit time), and oxygen consumption (, measured in a respirometer by an open-flow methodology). When exposed to slow cooling these hatchlings had a higher lower critical temperature (LCT) of thermoneutrality and higher , and slightly higher vocalization than Controls. In a thermal gradient, T (a) pref averaged 34.3 +/- A 0.3 A degrees C, or 1 A degrees C higher than in Controls (33.4 +/- A 0.3 A degrees C; P < 0.05), in proportion with their higher LCT (38 +/- A 0.1 A degrees C instead of 36.7 +/- A 0.3 A degrees C; P < 0.001), so that the T (a) pref - LCT difference (-3.6 +/- A 0.3 A degrees C) was similar to Controls (-3.3 +/- A 0.3 A degrees C). In conclusion, in chicken hatchlings T (a) pref was lower than LCT irrespective of the magnitude of their thermogenic response. It was estimated that, at T (a) pref, was similar to 20 % higher than at thermoneutrality. Such metabolic increase could carry some physiological advantage and the choice of T (a) pref may reflect the hatchling's needs to maintain slightly elevated. | en |
dc.description.affiliation | McGill Univ, Dept Physiol, Montreal, PQ H3G 1Y6, Canada | |
dc.description.affiliation | Sao Paulo State Univ, Dept Anim Morphol & Physiol, Coll Agr & Vet Sci, Jaboticabal, SP, Brazil | |
dc.description.affiliationUnesp | Sao Paulo State Univ, Dept Anim Morphol & Physiol, Coll Agr & Vet Sci, Jaboticabal, SP, Brazil | |
dc.description.sponsorship | Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) | |
dc.format.extent | 631-639 | |
dc.identifier | http://dx.doi.org/10.1007/s00360-014-0828-x | |
dc.identifier.citation | Journal Of Comparative Physiology B-biochemical Systemic And Environmental Physiology. Heidelberg: Springer Heidelberg, v. 184, n. 5, p. 631-639, 2014. | |
dc.identifier.doi | 10.1007/s00360-014-0828-x | |
dc.identifier.issn | 0174-1578 | |
dc.identifier.uri | http://hdl.handle.net/11449/113207 | |
dc.identifier.wos | WOS:000338295600008 | |
dc.language.iso | eng | |
dc.publisher | Springer | |
dc.relation.ispartof | Journal of Comparative Physiology B: Biochemical Systemic and Environmental Physiology | |
dc.relation.ispartofjcr | 2.517 | |
dc.relation.ispartofsjr | 0,952 | |
dc.rights.accessRights | Acesso restrito | |
dc.source | Web of Science | |
dc.subject | Bird | en |
dc.subject | newborn | en |
dc.subject | Behaviour | en |
dc.subject | Thermoneutrality | en |
dc.subject | Thermoregulation | en |
dc.title | Thermogenesis, vocalization, and temperature preference of 1-day-old chicken hatchlings after cold-exposure in late embryogenesis | en |
dc.type | Artigo | |
dcterms.license | http://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0 | |
dcterms.rightsHolder | Springer | |
unesp.campus | Universidade Estadual Paulista (Unesp), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabal | pt |
unesp.department | Morfologia e Fisiologia Animal - FCAV | pt |