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A panting score index for sheep.

A M Lees1, M L Sullivan2, J C W Olm3

  • 1School of Agriculture and Food Sciences, Animal Science Group, The University of Queensland, Gatton, QLD, 4343, Australia. a.lees@uqconnect.edu.au.

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Assessing sheep heat load is challenging. A new panting score (PS) index, strongly correlated with respiration rate (RR), offers a reliable visual method for evaluating heat stress in sheep under field conditions.

Keywords:
Heat stressPanting scoreRespiration rateRespiratory dynamicsSheepThermal comfort

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Area of Science:

  • Animal Science
  • Physiology
  • Environmental Biology

Background:

  • Respiration rate (RR) is a key indicator of heat dissipation in sheep.
  • Measuring RR in field conditions is difficult, necessitating alternative methods.
  • Panting score (PS) in cattle offers a visual alternative for assessing heat stress.

Purpose of the Study:

  • To evaluate the relationship between respiration rate (RR) and panting score (PS) in sheep.
  • To determine the efficacy of a developed PS index for assessing heat load in sheep.
  • To adapt and enhance the existing sheep PS index using cattle-based descriptors.

Main Methods:

  • One hundred forty-four Merino wethers were subjected to thermoneutral (TN) and hot (HOT) treatments in a climate-controlled study.
  • Respiration rate and panting score were recorded at 3-hour intervals daily.
  • Pearson's correlation and general linear models were used to analyze the relationship between PS, RR, and other factors.

Main Results:

  • A strong positive correlation (r=0.71, P<0.0001) was found between respiration rate and panting score.
  • Sheep in the HOT treatment exhibited significantly higher mean PS (1.49) compared to the TN treatment (1.17).
  • Increased RR was associated with standing posture, and individual animal ID influenced RR variations.

Conclusions:

  • The developed comprehensive PS index is a viable visual tool for assessing heat load in sheep.
  • The PS index provides a practical alternative to direct RR measurement for field evaluations.
  • Individual animal characteristics and environmental conditions influence thermoregulatory responses in sheep.