Sensible and latent heat loss from the body surface of Holstein cows in a tropical environment

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dc.contributor.authorMaia, ASC
dc.contributor.authordaSilva, R. G.
dc.contributor.authorLoureiro, CMB
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:21:43Z
dc.date.available2014-05-20T15:21:43Z
dc.date.issued2005-09-01
dc.description.abstractThe general principles of the mechanisms of heat transfer are well known, but knowledge of the transition between evaporative and non-evaporative heat loss by Holstein cows in field conditions must be improved, especially for low-latitude environments. With this aim 15 Holstein cows managed in open pasture were observed in a tropical region. The latent heat loss from the body surface of the animals was measured by means of a ventilated capsule, while convective heat transfer was estimated by the theory of convection from a horizontal cylinder and by the long-wave radiation exchange based on the Stefan-Boltzmann law. When the air temperature was between 10 and 36 degrees C the sensible heat transfer varied from 160 to -30 W m(-2), while the latent heat loss by cutaneous evaporation increased from 30 to 350 W m(-2). Heat loss by cutaneous evaporation accounted for 20-30% of the total heat loss when air temperatures ranged from 10 to 20 degrees C. At air temperatures > 30 degrees C cutaneous evaporation becomes the main avenue of heat loss, accounting for approximately 85% of the total heat loss, while the rest is lost by respiratory evaporation.en
dc.description.affiliationSão Paulo State Univ, Coll Agr & Vet Sci, Dept Anim Sci, Lab Bioclimatol, BR-14884900 Jaboticabal, São Paulo, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Coll Agr & Vet Sci, Dept Anim Sci, Lab Bioclimatol, BR-14884900 Jaboticabal, São Paulo, Brazil
dc.format.extent17-22
dc.identifierhttp://dx.doi.org/10.1007/s00484-005-0267-1
dc.identifier.citationInternational Journal of Biometeorology. New York: Springer, v. 50, n. 1, p. 17-22, 2005.
dc.identifier.doi10.1007/s00484-005-0267-1
dc.identifier.issn0020-7128
dc.identifier.urihttp://hdl.handle.net/11449/32830
dc.identifier.wosWOS:000231882600003
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofInternational Journal of Biometeorology
dc.relation.ispartofjcr2.577
dc.relation.ispartofsjr0,897
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectthermoregulationpt
dc.subjectHolstein cowspt
dc.subjectbody surfacept
dc.subjectheat losspt
dc.subjecttropical environmentpt
dc.titleSensible and latent heat loss from the body surface of Holstein cows in a tropical environmenten
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer

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