How the herd works
All the horses of the Adatlisai Asekwui live in bands, ruled by one stallion and made up of the stallion's mares and foals. To outsiders, it might seem that the stallions dominate the mares, but the horses would disagree.
The mares of the Adatlisai Asekwui join bands of their free will, after watching a display of courage and skill by a stallion. Usually, stallions challenge one another to try and win mares. Unless they are the head mare of their harem, mares usually change stallions several times in their lives. They value their freedom, and tend to dislike feeling tied to any stallion - particularly a weak stallion, as all of the horses value strength. It's a harsh world and they migrate through harsh lands. No mare wants to be with a stallion too weak to defend the band against marauding carnivores.
It does happen from time to time, but it is usually very rare to find a stallion that abuses or intimidates his mare. The herd considers stallions that hurt or frighten their mares cowards, and inferior. They are very scornful of any male that has to resort to force to keep a female by his side. In their eyes, it means a male lacks the confidence and is too weak to prove himself a true warrior in the eyes of his females. If a male is abusive or an ineffective leader, mares can complain to the Matriarch of the herd, who will inform the Patriarch. Depending on the severity of the offense, the stallion may be temporarily shunned or even exiled.
Young fillies stay with their fathers until they are adolescent or adult -- old enough for another stallion to challenge for them. Their mothers usually stay, but if their mothers move to another band the fillies almost always stay with their fathers. It is considered unlucky and unwise for mothers to bring a young unmated mare into another stallion's band.
Young colts are expected to leave the herd at adolescence to gain experience. When they return as adults, they must challenge a stallion and win one of his mares to earn their way back into the herd. They may bring outside females home with them, but they will not be admitted back into the herd until they have battled a herd stallion for one of his mares.
Stallions are expected to lead their band to the best grazing, the freshest water and the safest places. They are responsible for the safety of their ladies and their young. If the band is attacked, the stallion is the first line of defense.