Factors affecting the harem formation process by young Misaki feral stallions.

The research explores how young feral stallions in the Misaki area of Japan form new harems, the methods they use to acquire mares, and the factors involved in this process. The study discovered young stallions form new harems between the ages 3.8-7.6 years and the formation often coincides with the start of the general breeding season.

Formation Age and Timing

• The study revealed that young Misaki stallions tend to initiate new harems when they are between 3.8 to 7.6 years old.
• Most of the new harems, about 93%, were formed at the beginning of the breeding season.

Acquisition Methods

• Young stallions were found to predominantly form new harems by gathering unattached, wandering mares, accounting for 87% of harem formations.
• Only 13% of the young stallions managed to form harems by stealing mares from existing groups, specifically targeting those that were unstable within their bands.

Factors Affecting Harem Formation

• The high female to male ratio (3:1) was a significant contributing factor in the ability of young stallions to form harems. This ratio indicates that there’s an abundance of mares for each stallion, enabling harem formation even at a young age.
• On average, there were 2.5 wandering mares for each stallion, another key factor influencing the successful creation of a harem by young stallions.
• Another interesting observation was that there was no observed aggression, fighting or active herding behavior amongst the stallions at the time of new harem formation. This could be due to the tendency of “unstable” mares to easily leave their groups, hence no need for the stallions to fight over them.

This unique pattern of harem formation provides insights into the behavior and social dynamics of feral stallions and could be key in understanding and managing their populations.