Physiologic and hematologic values in Nelson desert bighorn sheep

Area of Science:

• Veterinary medicine
• Wildlife biology
• Physiology

Background:

• Establishing baseline physiologic and hematologic values is crucial for wildlife health assessments.
• Nelson desert bighorn sheep (Ovis canadensis nelsoni) are a distinct subspecies requiring specific reference data.
• Previous studies have documented values for other bighorn sheep subspecies and domestic sheep.

Purpose of the Study:

• To establish reference physiologic and hematologic values for free-ranging Nelson desert bighorn sheep.
• To compare values between two different capture methods: drop net and chemical immobilization.
• To compare these values with those of other bighorn sheep subspecies and domestic sheep.

Main Methods:

• Two groups of free-ranging Nelson desert bighorn sheep were studied.
• Group I (n=11) was captured using a drop net.
• Group II (n=16) was immobilized using Etorphine via projectile syringes.

Main Results:

• Group I sheep exhibited mean glucose levels, respiration rates, and leucocyte counts more than twice those of Group II sheep.
• No significant differences were observed in other measured parameters between the two groups.
• Collected data were compared with existing values for Rocky Mountain bighorn sheep (O. c. canadensis), California bighorn sheep (O. c. californiana), and domestic sheep (O. aries).

Conclusions:

• Capture method significantly impacts certain physiologic and hematologic parameters in Nelson desert bighorn sheep.
• Drop net capture appears to induce a greater stress response compared to Etorphine immobilization.
• These findings highlight the importance of considering capture methods when interpreting wildlife health data.