Is the temperature-humidity index the best indicator of heat stress in lactating dairy cows in a subtropical environment?

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dc.contributor.authorHansen, Peter Johannes
dc.contributor.buuauthorDikmen, Serdal
dc.contributor.departmentUludağ Üniversitesi/Veteriner Fakültesi/Hayvan Bilimleri Anabilim Dalı.tr_TR
dc.contributor.orcid0000-0002-5611-4993tr_TR
dc.contributor.researcheridA-5731-2018tr_TR
dc.contributor.scopusid8280302600tr_TR
dc.date.accessioned2021-10-21T09:15:23Z
dc.date.available2021-10-21T09:15:23Z
dc.date.issued2009-01
dc.description.abstractSeveral temperature-humidity indexes (THI) have been used to estimate the degree of thermal stress experienced by dairy cows. The present objectives were to develop equations using meteorological variables that predicted rectal temperature of lactating cows in a subtropical environment and compare the goodness of fit of these equations to those using 8 different THI. Rectal temperature was measured between 1500 and 1700 h in 1,280 lactating Holstein cows in north central Florida between August and December. Meteorological data recorded in the barn where cows were located included dry bulb temperature (Tdb), relative humidity (RH), dew point temperature, and wind speed. Wet bulb temperature was calculated. In the first series of analyses, regression analysis was used to model rectal temperature using the meteorological variables as well as THI. The r(2) using Tdb (0.41) was slightly less than for models using all but one THI (r(2) between 0.42 and 0.43). The r(2) for equations using Tdb could be improved by adding RH (r(2) = 0.43) or RH and RH2 (r(2) = 0.44) to the model. In the second analysis, regression analysis was performed using forward selection, backward elimination, and stepwise selection procedures with the meteorological variables. All models gave a similar goodness of fit (r(2) = 0.44). An analysis of variance with rectal temperature as a class variable was performed to determine the least squares means of meteorological measurements associated with hyperthermia. A Tdb of 29.7 degrees C was associated with rectal temperature of 39 degrees C, and a Tdb of 31.4 degrees C was associated with rectal temperature of 39.5 degrees C. In conclusion, Tdb is nearly as good a predictor of rectal temperatures of lactating Holsteins in a subtropical environment as THI. Estimates of values of meteorological variables associated with specific rectal temperatures should prove valuable in relating environmental conditions to the magnitude of hyperthermia experienced by heat-stressed cows.en_US
dc.identifier.citationDikmen, S. ve Hansen, P. J.(2009). " Is the temperature-humidity index the best indicator of heat stress in lactating dairy cows in a subtropical environment?". Journal Of Dairy Science, 92(1), 109-116.en_US
dc.identifier.endpage116tr_TR
dc.identifier.issn0022-0302
dc.identifier.issue1tr_TR
dc.identifier.pubmed19109269tr_TR
dc.identifier.scopus2-s2.0-58349107907tr_TR
dc.identifier.startpage109tr_TR
dc.identifier.urihttps://doi.org/10.3168/jds.2008-1370
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022030209703157
dc.identifier.urihttp://hdl.handle.net/11452/22424
dc.identifier.volume92tr_TR
dc.identifier.wos000261948600012tr_TR
dc.indexed.pubmedPubmeden_US
dc.indexed.scopusScopusen_US
dc.indexed.wosSCIEen_US
dc.language.isoenen_US
dc.publisherElsevier Scienceen_US
dc.relation.collaborationYurt dışıtr_TR
dc.relation.journalJournal Of Dairy Sciencetr_TR
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergitr_TR
dc.relation.tubitakTÜBİTAKtr_TR
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectTemperature-humidity indexen_US
dc.subjectDairy cattleen_US
dc.subjectRectal temperatureen_US
dc.subjectHeat stressen_US
dc.subjectCattleen_US
dc.subjectAgricultureen_US
dc.subjectFood science & technologyen_US
dc.subjectBosen_US
dc.subject.scopusDairy Cows; Holstein-Friesian Cattle; Milk Yielden_US
dc.subject.wosAgriculture, dairy & animal scienceen_US
dc.subject.wosFood science & technologyen_US
dc.titleIs the temperature-humidity index the best indicator of heat stress in lactating dairy cows in a subtropical environment?en_US
dc.typeArticle
dc.wos.quartileQ1en_US

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