Abstract
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.
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Abbreviations
- cDNA:
-
Complementary DNA
- EF:
-
Efficient cows
- FZEA:
-
Faculty of Animal Science and Food Engineering
- HSPs:
-
Heat shock proteins
- NEF:
-
Inefficient cows
- IRT:
-
Infrared thermography trait
- L×C×W:
-
Length × circumference × weight
- m:
-
Meter
- PBMCs:
-
Peripheral blood mononuclear cells
- qPCR:
-
Quantitative polymerase chain reaction
- RBCs:
-
Red blood cells
- RF:
-
Respiratory frequency
- RH:
-
Relative humidity
- RT-qPCR:
-
Reverse transcription
- SR:
-
Sweating rate
- T a :
-
Air temperature
- T bg :
-
Black globe temperature
- T dp :
-
Dew point temperature
- THI:
-
Temperature humidity index
- T oc :
-
Ocular temperature
- T r :
-
Rectal temperature
- T t :
-
Tail temperature
- T vag :
-
Vaginal temperature
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Acknowledgements
This research was supported by São Paulo Research Foundation, no. 2011/09282-3. We would also like to show our gratitude to Prof. Ed Hoffman Madureira from University of São Paulo, who provided insight and expertise that greatly assisted the research. This article contains parts derived from two conference abstract presented in the VII Brazilian Congress of Biometeorology, Ambience, Behavior and Animal Welfare and are stated in Figshare proceedings (DOIs: https://doi.org/10.6084/m9.figshare.5176753; https://doi.org/10.6084/m9.figshare.5176756).
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All procedures performed in studies involving animals were in accordance with the current Federal Law no. 11.794, sanctioned by the President of the Republic on November 8, 2008. The law is available in full at http://planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Lei/L11794.htm, and is known as the Arouca Law, which regulates the scientific use of animals in Brazil. The local committee certifies the protocol number CEUA 13.1.2186.74.2, which involves the production, maintenance and/or use of animals belonging to the phylum Chordata, subphylum Vertebrata (except human beings), for scientific research purposes (or teaching)—it is in accordance with Law 11.794, of October 8, 2008, Decree 6899, of July 15, 2009, with the rules issued by the National Council for Control of Animal Experimentation (CONCEA), and was approved by the Ethics Committee on Animal Use of the School of Animal Science and Food Engineering of São Paulo University.
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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. The animals used in the experiment had prior approval of the Ethics Faculty Committee, receiving the protocol number no. 13.1.2186.74.2.
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Hooper, H.B., Titto, C.G., Gonella-Diaza, A.M. et al. Heat loss efficiency and HSPs gene expression of Nellore cows in tropical climate conditions. Int J Biometeorol 63, 1475–1486 (2019). https://doi.org/10.1007/s00484-018-1576-5
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DOI: https://doi.org/10.1007/s00484-018-1576-5