How stallions influence the dynamic of collective movements in two groups of domestic horses, from departure to arrival.

The research article explores how male stallions, in polygynous horse herds, influence decision making and group movement dynamics. It provides empirical evidence that, contrary to traditional views, stallions do not necessarily take a leadership role in group dynamics, but still play a significant role as group monitors.

Objective and Method of the Study

• The study aimed to examine the extent of involvement and potential influence of male stallions during decision-making processes in horse herds (polygynous species).
• The researchers conducted a thorough examination of the behaviour of two domestic stallions during collective movements within their groups.

Findings of the Study

• Stallions were found to initiate group movement rarely and at times could not recruit the entire group to move.
• When stallions were followers rather than leaders during movement, they did not hasten the group’s joining process (other horses joining the movement).
• Both stallions tended to occupy the rear position during movement and frequently exhibited behaviours indicating that they were monitoring the group’s actions.
• Herding behaviour was observed in only one of the two studied stallions and mostly occurred outside of group movement periods.
• To further evaluate the stallion’s influence, the researchers temporarily removed the herd-leading stallion from its group. The result was significant changes in group dynamics, with collective movements becoming notably slower (up to five times), and female horses appearing more dispersed compared to when the stallion was present.

Conclusion of the Study

• The study concludes that the stallions, while not directly influencing decision-making processes or leading the group, maintain a role as group monitors from start to finish of group movements.
• Additionally, it suggests that this role as a monitor indirectly influences the dynamic of the horses’ collective movement, evidenced by the behavioural changes observed when the stallion was removed from the group.