Thermoregulatory responses of Holstein cows exposed to experimentally induced heat stress

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dc.contributor.authorFerrazza, Rodrigo de Andrade [UNESP]
dc.contributor.authorMogollon Garcia, Henry David [UNESP]
dc.contributor.authorVallejo Aristizabal, Viviana Helena [UNESP]
dc.contributor.authorNogueira, Camilla de Souza [UNESP]
dc.contributor.authorVerissimo, Cecilia Jose
dc.contributor.authorSartori, Jose Roberto [UNESP]
dc.contributor.authorSartori, Roberto
dc.contributor.authorPinheiro Ferreir, Joao Carlos [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionInst Anim Sci
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.date.accessioned2018-11-26T17:31:25Z
dc.date.available2018-11-26T17:31:25Z
dc.date.issued2017-05-01
dc.description.abstractHeat stress (HS) adversely influences productivity and welfare of dairy cattle. We hypothesized that the thermoregulatory mechanisms vary depending on the exposure time to HS, with a cumulative effect on the adaptive responses and thermal strain of the cow. To identify the effect of HS on adaptive thermoregulatory mechanisms and predictors of caloric balance, Holstein cows were housed in climate chambers and randomly distributed into thermoneutral (TN; n= 12) or HS (n= 12) treatments for 16 days. Vaginal temperature (VT), rectal temperature (Tre), respiratory rate (RR), heart rate (HR), and dry matter intake (DMI) were measured. The temperature and humidity under TN were 25.9 +/- 0.2 degrees C and 73.0 +/- 0.8%, respectively, and under HS were 36.3 +/- 0.3 degrees C and 60.9 +/- 0.9%, respectively. The RR of the HS cows increased immediately after exposure to heat and was higher (76.02 +/- 1.70 bpm, p < 0.001) than in the TN (39.70 +/- 0.71 bpm). An increase in Tre (39.87 +/- 0.07 degrees C in the HS vs. 38.56 +/- 0.03 degrees C in the TN, p < 0.001) and in VT (39.82 +/- 0.10 degrees C in the HS vs. 38.26 +/- 0.03 degrees C in the TN, p < 0.001) followed the increase in RR. A decrease (p < 0.05) in HR occurred in the HS (62.13 +/- 0.99 bpm) compared with the TN (66.23 +/- 0.79 bpm); however, the magnitude of the differences was not the same over time. The DMI was lower in HS cows from the third day (8.27 +/- 0.33 kg d(-1) in the HS vs. 14.03 +/- 0.29 kg d(-1) in the TN, p < 0.001), and the reduction of DMI was strongly affected (r= -0.65) by changes in the temperature humidity index. The effect of environmental variables from the previous day on physiological parameters and DMI was more important than the immediate effect, and ambient temperature represented the most determinant factor for heat exchange. The difference in the responses to acute and chronic exposure to HS suggests an adaptive response. Thus, intense thermal stress strongly influence thermoregulatory mechanisms and the acclimation process depend critically on heat exposure time.en
dc.description.affiliationSao Paulo State Univ, Sch Vet Med & Anim Sci, Dept Anim Reprod & Vet Radiol, Rua Prof Dr Walter Mauricio Correa S-N, BR-18618681 Botucatu, SP, Brazil
dc.description.affiliationSao Paulo State Univ, Sch Vet Med & Anim Sci, Dept Anim Breeding & Nutr, Rua Prof Dr Walter Mauricio Correa S-N, BR-18618681 Botucatu, SP, Brazil
dc.description.affiliationInst Anim Sci, Rua Heitor Penteado 56, BR-13460000 Nova Odessa, SP, Brazil
dc.description.affiliationUniv Sao Paulo, ESALQ, Dept Anim Sci, Av Padua Dias 11, BR-13418900 Piracicaba, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Sch Vet Med & Anim Sci, Dept Anim Reprod & Vet Radiol, Rua Prof Dr Walter Mauricio Correa S-N, BR-18618681 Botucatu, SP, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Sch Vet Med & Anim Sci, Dept Anim Breeding & Nutr, Rua Prof Dr Walter Mauricio Correa S-N, BR-18618681 Botucatu, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 2012/18297-7
dc.description.sponsorshipIdFAPESP: 2013/20083-8
dc.format.extent68-80
dc.identifierhttp://dx.doi.org/10.1016/j.jtherbio.2017.03.014
dc.identifier.citationJournal Of Thermal Biology. Oxford: Pergamon-elsevier Science Ltd, v. 66, p. 68-80, 2017.
dc.identifier.doi10.1016/j.jtherbio.2017.03.014
dc.identifier.fileWOS000401388300010.pdf
dc.identifier.issn0306-4565
dc.identifier.urihttp://hdl.handle.net/11449/162794
dc.identifier.wosWOS:000401388300010
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal Of Thermal Biology
dc.relation.ispartofsjr0,782
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectHyperthermia
dc.subjectThermoregulation
dc.subjectThermal index
dc.subjectAcclimation
dc.subjectClimate chamber
dc.subjectBos taurus
dc.titleThermoregulatory responses of Holstein cows exposed to experimentally induced heat stressen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0003-0820-5847[2]
unesp.author.orcid0000-0003-2691-8250[6]
unesp.author.orcid0000-0001-6917-0057[7]

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Artigos - Reprodução Animal e Radiologia Veterinária - FMVZ
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