Do newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?

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Autor(es): dc.contributorFederal University of Paraiba-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorFederal University of Paraíba-
Autor(es): dc.contributorUniversity of the Witwatersrand-
Autor(es): dc.contributorRajiv Gandhi Institute of Veterinary Education and Research Puducherry-
Autor(es): dc.creatorFonsêca, V. F.C.-
Autor(es): dc.creatorDos Santos, J. D.C.-
Autor(es): dc.creatorSaraiva, E. P.-
Autor(es): dc.creatorXavier Neta, G. C.-
Autor(es): dc.creatorMorais, L. K.C.-
Autor(es): dc.creatorBícego, K. C.-
Autor(es): dc.creatorPereira, W. E.-
Autor(es): dc.creatorPimenta Filho, E. C.-
Autor(es): dc.creatorMoura, G. A.B.-
Autor(es): dc.creatorSejian, V.-
Autor(es): dc.creatorFuller, A.-
Data de aceite: dc.date.accessioned2025-08-21T21:13:07Z-
Data de disponibilização: dc.date.available2025-08-21T21:13:07Z-
Data de envio: dc.date.issued2025-04-29-
Data de envio: dc.date.issued2024-09-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1007/s00484-024-02710-9-
Fonte completa do material: dc.identifierhttps://hdl.handle.net/11449/308212-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/308212-
Descrição: dc.descriptionWe assessed newborn lambs from two hair-coat sheep breeds, the black Santa Ines (n = 29) and white Dorper (n = 26), to determine how they behaviourally and physiologically respond to the prevailing thermal conditions in an equatorial semi-arid environment. Measurements of hair-coat surface temperature, rectal temperature and the lambs’ exposure to sun were recorded across the first 24 h of life every hour, after the lambs had received colostrum. Lambs and ewes were kept in a lambing pen and could freely move between a shaded area or be exposed to sun. During the study period, the air temperature ranged between 20 ºC and 34 ºC. When exposed to sun, lambs and ewes could experience as much as 1200 W m-2 of solar irradiance. Santa Ines lambs exhibited higher (highest density interval at 95%, HDI) hair-coat surface temperatures than did Dorper lambs. Overall, both Santa Ines and Dorper lambs sustained homeothermy, with a mean rectal temperature ranging from 38.7 ºC to 39.1 ºC between night and daytime phase, and a mean amplitude of ~ 0.8 ºC. Nevertheless, from 10:00 to 15:00, some lambs were found to be moderately hyperthermic. Five Santa Ines and three Dorper lambs had rectal temperatures above 40 ºC, and one Santa Ines lamb, while exposed to sun, had a rectal temperature of 41.3 ºC. Over this time period, lambs were more likely to move to shade (HDI at 95%). From 00:00 to 06:00, despite the air temperature being lower than the hair-coat surface, favouring high rates of sensible heat loss to the environment, no lamb exhibited signs of hypothermia (rectal temperature < 37.5 ºC). In conclusion, haired newborn lambs coped well with high levels of radiant heat during the daytime and lower temperatures at night. However, providing access to shade during the daytime is important to improve the welfare of newborn lambs delivered in equatorial semi-arid regions.-
Descrição: dc.descriptionAnimal Biometeorology and Ethology Group Department of Animal Science Federal University of Paraiba-
Descrição: dc.descriptionDepartment of Animal Morphology and Physiology São Paulo State University, SP-
Descrição: dc.descriptionDepartment of Fundamental and Social Sciences Federal University of Paraíba, Paraíba-
Descrição: dc.descriptionLaboratory of Animal Biometeorology São Paulo State University-
Descrição: dc.descriptionBrain Function Research Group School of Physiology University of the Witwatersrand-
Descrição: dc.descriptionRajiv Gandhi Institute of Veterinary Education and Research Puducherry-
Descrição: dc.descriptionDepartment of Animal Morphology and Physiology São Paulo State University, SP-
Descrição: dc.descriptionLaboratory of Animal Biometeorology São Paulo State University-
Formato: dc.format1837-1846-
Idioma: dc.languageen-
Relação: dc.relationInternational Journal of Biometeorology-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectAnimal welfare-
Palavras-chave: dc.subjectNeonates-
Palavras-chave: dc.subjectRadiant heat-
Palavras-chave: dc.subjectSheep production-
Palavras-chave: dc.subjectThermoregulation-
Título: dc.titleDo newborn lambs with black and white hair-coats in an equatorial semi-arid environment maintain homeothermy?-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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