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Models to predict both sensible and latent heat transfer in the respiratory tract of Morada Nova sheep under semiarid tropical environment

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Abstract

The aim of this study was to build a prediction model both sensible and latent heat transfer by respiratory tract for Morada Nova sheep under field conditions in a semiarid tropical environment, using easily measured physiological and environmental parameters. Twelve dry Morada Nova ewes with an average of 3 ± 1.2 years old and average body weight of 32.76 ± 3.72 kg were used in a Latin square design 12 × 12 (12 days of records and 12 schedules). Tidal volume, respiratory rate, expired air temperature, and partial vapor pressure of the expired air were obtained from the respiratory facial mask and using a physiological measurement system. Ewes were evaluated from 0700 to 1900 h in each day under shade. A simple nonlinear model to estimate tidal volume as a function of respiratory rate was developed. Equation to estimate the expired air temperature was built, and the ambient air temperature was the best predictor together with relative humidity and ambient vapor pressure. In naturalized Morada Nova sheep, respiratory convection seems to be a mechanism of heat transfer of minor importance even under mild air temperature. Evaporation from the respiratory system increased together with ambient air temperature. At ambient air temperature, up to 35 °C respiratory evaporation accounted 90 % of the total heat lost by respiratory system, on average. Models presented here allow to estimate the heat flow from the respiratory tract for Morada Nova sheep bred in tropical region, using easily measured physiological and environmental traits as respiratory rate, ambient air temperature, and relative humidity.

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Acknowledgments

We gratefully acknowledge the support of the Animal Science Department and Animal Biometeorology Laboratory of the Universidade Estadual de São Paulo, Brazil. This study was supported by Research Foundation of São Paulo State (FAPESP; Process number: 2011/17388-6). We thank all members of the Behaviour and Biometeorology Group of the Universidade Federal da Paraíba (BIOET) and the members of the Animal Biometeorology Innovation Group of the Universidade Estadual de São Paulo (INOBIO).

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Authors and Affiliations

  1. Universidade Federal da Paraiba, Paraiba, Areia, Brazil

    Vinícius Carvalho Fonseca, Edilson Paes Saraiva, Josinaldo Araújo da Silva, Walter Esfraim Pereira, Edgard Cavalcanti Pimenta Filho & Maria Elivânia Vieira Almeida

  2. Universidade Estadual Paulista, São Paulo, Jaboticabal, Brazil

    Alex Sandro Campos Maia & Carolina Cardoso Nagib Nascimento

Authors
  1. Vinícius Carvalho Fonseca
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  2. Edilson Paes Saraiva
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  3. Alex Sandro Campos Maia
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  4. Carolina Cardoso Nagib Nascimento
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  5. Josinaldo Araújo da Silva
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  6. Walter Esfraim Pereira
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  7. Edgard Cavalcanti Pimenta Filho
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  8. Maria Elivânia Vieira Almeida
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Correspondence to Vinícius Carvalho Fonseca.

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Fonseca, V.C., Saraiva, E.P., Maia, A.S.C. et al. Models to predict both sensible and latent heat transfer in the respiratory tract of Morada Nova sheep under semiarid tropical environment. Int J Biometeorol 61, 777–784 (2017). https://doi.org/10.1007/s00484-016-1255-3

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  • DOI: https://doi.org/10.1007/s00484-016-1255-3

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