An evaluation of chemical restraining agents in the horse.

The research examines the effectiveness of chemical restraining agents acepromazine, azaperone, and xylazine in horses. The results indicate that among the three, azaperone showed the best sedative results, allowing for a percutaneous needle muscle biopsy to be taken from six muscles in the horses.

Research Objectives and Methodology

• A total of seven horses were used in this study to evaluate the efficiency of three drugs; acepromazine (5 times the recommended dose), azaperone, and xylazine as chemical restraining agents.
• The experiment’s measurement of efficiency was the ability to carry out a percutaneous needle muscle biopsy on the horses.

Findings

• Azaperone emerged as the most effective, enabling a biopsy to be taken from six muscles in all the horses. Acepromazine and xylazine were less effective, with biopsies successfully taken from five and four horses, respectively.
• A transient increase in heart rate (tachycardia) and a decrease in packed cell volume were observed with both acepromazine and azaperone. However, all three drugs seemed to reduce the stress of muscle biopsy as determined by an increase in heart rate.
• Azaperone also resulted in an elevation in the plasma 11-OHCS levels when administered to control animals.

Limitations

• The research concluded that using changes in plasma 11-OHCS levels was not a reliable way to assess stress reduction with sedative agents, indicating the possibility of limitations in the means of measuring stress levels during the study.
• The dosage of acepromazine used was five times its recommended dosage, which could raise questions about the safety and possible side effects. This highlights the necessity of further investigation before making firm conclusions about its usage at this elevated dosage.