Camelid heat stress: 15 cases (2003-2011)

Area of Science:

• Veterinary Medicine
• Animal Physiology

Background:

• Heat stress is a significant concern in livestock, affecting animal health and productivity.
• South American camelids, including alpacas and llamas, are susceptible to environmental stressors.

Purpose of the Study:

• To describe novel findings associated with heat stress in South American camelids.
• To identify clinical and pathological changes indicative of heat stress in this species.

Main Methods:

• A case series involving 15 South American camelids with clinical signs of illness after warm environment exposure.
• Clinical evaluation, packed cell volume, and albumin concentration measurements.
• Histopathological examination of spinal cord tissue.

Main Results:

• Novel findings included decreased packed cell volume and albumin concentration.
• Mild spinal axonal degeneration was observed in affected camelids.
• Clinical signs were associated with exposure to a warm environment in otherwise healthy animals.

Conclusions:

• Heat stress should be considered in the differential diagnosis of weak South American camelids with a history of hyperthermia.
• The observed hematological and neurological changes are novel indicators of heat stress in camelids.