Journal of Animal Behaviour and Biometeorology
https://jabbnet.com/article/doi/10.14269/2318-1265.v01n01a04
Journal of Animal Behaviour and Biometeorology
Short Communication Open Access

Respiratory heat loss in Morada Nova sheep in Brazilian semi-arid regions

Steffan Edward Octávio Oliveira, Cíntia Carol de Melo Costa

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Abstract

This study aimed to evaluate the respiratory heat loss in sheep from the equations developed for this species and its relations with meteorological variables in semi-arid regions. The respiratory heat loss (sensible and latent) was estimated through the equations in the literature for four 12-month-old male Morada Nova sheep, kept in an installation with shading of ceramic tiles and a 3-meter-high ceiling. The following environmental variables were measured: air temperature (TA), wind speed (U), relative humidity (RH) and partial vapor pressure (PP{tA}). The physiological variables measured: rectal temperature (TR) and respiratory rate (RR). Statistical analysis was performed based on regression using PROC REG procedure in SAS. The latent respiratory heat loss showed a linear and positive correlation with ambient temperature. However, the respiratory convection showed a linear and negative correlation, but with incipient values. Therefore, the latent heat loss is more important than the sensible one in the respiratory system to maintain thermoregulation of Morada Nova sheep in a semi-arid region of Brazil.

Keywords

respiratory convection, respiratory evaporation, small ruminants, thermoregulation

References

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Da Silva RG, Guilhermino MM, Morais DAEF (2010) Thermal radiation absorbed by dairy cows in pasture. International Journal of Biometeorology 54:5-11.

Da Silva RG, Maia ASC, Costa LLM, Queiroz JAF (2012) Latent heat loss of dairy cows in an equatorial semi-arid environment. International Journal of Biometeorology 56:927-932.

Jessen C, Pongratz H (1979) Air humidity and carotid rate function in thermoregulation of the goat. The Journal of Physiology 292:469-479.

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Submitted date:
07/15/2013

Reviewed date:
07/26/2013

Accepted date:
07/26/2013

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J Anim Behav Biometeorol

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