Bio-thermal responses and heat balance of a hair coat sheep breed raised under an equatorial semi-arid environment

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dc.contributor.authorCarvalho Fonseca, Vinicius de Franca [UNESP]
dc.contributor.authorCampos Maia, Alex Sandro [UNESP]
dc.contributor.authorSaraiva, Edilson Paes
dc.contributor.authorMelo Costa, Cintia Carol de [UNESP]
dc.contributor.authorSilva, Roberto Gomes da [UNESP]
dc.contributor.authorAbdoun, Khalid Ahmed
dc.contributor.authorAl-Haidary, Ahmed Abrahim
dc.contributor.authorSamara, Emad Mohammed
dc.contributor.authorFuller, Andrea
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionKing Saud Univ
dc.contributor.institutionUniv Witwatersrand
dc.contributor.institutionUniv Fed Paraiba
dc.date.accessioned2020-12-10T16:56:19Z
dc.date.available2020-12-10T16:56:19Z
dc.date.issued2019-08-01
dc.description.abstractLong-term assessments of bio-thermal responses in a hair coat sheep breed were performed to investigate the effect of the thermal environment on their physiological performance and thermal balance. Twelve healthy non-lactating Morada Nova ewes (3 +/- 1.2 years old, body mass 32.7 +/- 3.7 kg) were assigned in two 12 x 12 Latin square designs (from 07:00 to 19:00 h and from 19:00 to 07:00 h, respectively) for assessments of their biothermal responses during 24 consecutive days. There was a monophasic pattern in the ambient temperature (T-A), which ranged between 21 and 38 degrees C, thereby exposing the ewes to different levels of surrounding T-A over the day and influencing several of their bio-thermal responses (P = 0.0001). Their body temperatures (i.e., rectal, skin, and hair coat surface temperatures) gradually increased (P = 0.0001) from 04:00 h. The mean peak for rectal temperature (39.3 degrees C) was recorded at 19:00 h, while for skin and hair coat surface temperatures it occurred at 13:00 and 14:00 h, respectively. The sensible heat loss by long wave radiation and surface convection exceeded the metabolism of ewes when the T-A was below 24 degrees C, which usually occurred between 24:00 and 06:00 h. During exposure to higher ambient temperatures, the sheep increased respiratory evaporative heat loss, without panting. In conclusion, the sheep regulated rectal temperature within a relatively narrow range of 1.4 degrees C over 24 h, and appear to be well adapted to coping with heat. Minimum 24 h body temperature was correlated with minimum T-A, indicating that heat conservation strategies are likely to be important for Morada Nova sheep in a tropical biotype at night, when rates of sensible heat loss exceed the heat generated by metabolism.en
dc.description.affiliationSao Paulo State Univ, Biometorol Lab, Innovat Grp Biometeorol Behav & Anim Welf INOBIO, Jaboticabal, Brazil
dc.description.affiliationKing Saud Univ, Dept Anim Prod, Riyadh, Saudi Arabia
dc.description.affiliationUniv Witwatersrand, Sch Physiol, Brain Funct Res Grp, Johannesburg, South Africa
dc.description.affiliationUniv Fed Paraiba, Anim Biometeorol & Ethol Grp BIOET, Areia, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Biometorol Lab, Innovat Grp Biometeorol Behav & Anim Welf INOBIO, Jaboticabal, Brazil
dc.description.sponsorshipDeanship of Scientific Research at King Saud University
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdDeanship of Scientific Research at King Saud University: RGP-VPP-171
dc.description.sponsorshipIdFAPESP: 2011/17388-6
dc.format.extent83-91
dc.identifierhttp://dx.doi.org/10.1016/j.jtherbio.2019.05.024
dc.identifier.citationJournal Of Thermal Biology. Oxford: Pergamon-elsevier Science Ltd, v. 84, p. 83-91, 2019.
dc.identifier.doi10.1016/j.jtherbio.2019.05.024
dc.identifier.issn0306-4565
dc.identifier.urihttp://hdl.handle.net/11449/194844
dc.identifier.wosWOS:000486107400009
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal Of Thermal Biology
dc.sourceWeb of Science
dc.subjectMorada nova sheep
dc.subjectBody temperature
dc.subjectMetabolism
dc.subjectNycthemeral cycle
dc.subjectSensible heat loss
dc.subjectAdaptation
dc.titleBio-thermal responses and heat balance of a hair coat sheep breed raised under an equatorial semi-arid environmenten
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0001-7333-0105[2]
unesp.author.orcid0000-0001-9461-1723[3]
unesp.author.orcid0000-0002-7011-5407[4]

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