Absence of population asymmetry in the American Quarter Horse (Equus ferus caballus) performing skilled left and right manoeuvres in reining competition.

The research article investigates if there is a preferential difference between left and right maneuvers in the American Quarter Horse during reining competitions, and it concludes that there is no noticeable asymmetry in this regard.

Methodology

• The research utilized the results of judges’ scores to inspect any asymmetry in horse maneuvers.
• It scrutinized the records of five judges who had evaluated the reining performances of 482 three-year-old American Quarter Horses partaking in a significant competition.
• The reining discipline involves the horse going through maneuvers like spins, circles, and stops towards either the left or right, with symmetrical performance being regarded critical in the judging parameters.

Results

• The judges’ scores were sensitive to variables such as the level of the performance, sex of the horse, and the type of maneuver being performed.
• However, contrary to research done on many other animal species which found asymmetry in emotional responsivity and spontaneous behaviour, this study found no evidence of a population asymmetry in the American Quarter Horse’s left Vs. right maneuver performance.

Discussion

• The authors analyze the findings in relation to the requirement of employing a large subject pool when measuring asymmetry.
• They also explore the distinction between individual Vs. population asymmetry as determined by different morphological and behavioral indicators.
• Furthermore, they discuss the possible impact that behavioral training might have on asymmetry, indicating that rigorous and suitable training could help overcome any inherent bias towards one side.

In conclusion, the research study brings forward the lack of population asymmetry in the American Quarter Horse while performing certain key maneuvers in reining competitions, contradicting the notion of handedness commonly found in humans and other animals. The study also suggests that individual asymmetries if any, may be offset by appropriate training to align with the demands of the sport.