Heat loss efficiency and HSPs gene expression of Nellore cows in tropical climate conditions.

Autor: Hooper HB; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Titto CG; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil. crisgtitto@usp.br., Gonella-Diaza AM; Faculty of Veterinary Medicine and Animal Science, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Henrique FL; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Pulido-Rodríguez LF; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Longo ALS; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Leme-Dos-Santos TMDC; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Geraldo ACAPM; Biometeorology and Animal Welfare Laboratory, Institute of Mediterranean Agricultural and Environmental Sciences, University of Évora, Apartado 94, 7006-554, Évora, Portugal., Pereira AMF; Biometeorology and Animal Welfare Laboratory, Institute of Mediterranean Agricultural and Environmental Sciences, University of Évora, Apartado 94, 7006-554, Évora, Portugal., Binelli M; Faculty of Veterinary Medicine and Animal Science, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Balieiro JCC; Faculty of Veterinary Medicine and Animal Science, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil., Titto EAL; Department of Animal Science, Faculty of Animal Science and Food Engineering, University of São Paulo, Duque de Caxias Norte Avenue, 225, Pirassununga, SP, 13635-900, Brazil.
Jazyk: angličtina
Zdroj: International journal of biometeorology [Int J Biometeorol] 2019 Nov; Vol. 63 (11), pp. 1475-1486. Date of Electronic Publication: 2018 Aug 16.
DOI: 10.1007/s00484-018-1576-5
Abstrakt: Adaptation is a relevant characteristic to be understood in livestock animals in order to maintain and raise productivity. In Brazil, the Nellore beef cattle are widely disseminated and well-adapted breed that present good thermoregulatory characteristics for tropical environment conditions. Conversely, the physiological and cellular mechanisms required for thermoregulation and thermotolerance in this breed are still limited. The aim of this study was to comprehend the heat loss efficiency at the whole animal level and heat shock response at the cellular level of Nellore cows in tropical climate conditions. Healthy purebred Nellore cows were classified according to their capacity to lose body heat as Efficient or Inefficient based on vaginal temperature which was continuously monitored by data-loggers. Rectal, tail, and ocular temperatures, sweating rate, and respiratory frequency were collected to assess other thermoregulatory responses. Peripheral mononuclear cells were used for gene expression of heat shock proteins 60, 70, and 90 induced by in vitro heat treatments at 38, 40, and 42 °C. In our findings, the Efficient cows presented higher sweating rates compared to Inefficient cows that presented higher rectal temperature with greater amplitude of vaginal temperature profile. Transcription of the HSP genes was stable at 38 and 40 °C and decreased for all HSP genes at 42 °C. In conclusion, the Nellore efficiency to lose heat was mainly associated with their sweating capacity and cellular thermotolerance confirmed by the maintenance of heat shock proteins transcripts under heat stress. Taken together, this knowledge contributes as a future key for genetic selection of adapted animals.
Databáze: MEDLINE
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