Board Thread:General Mod Discussion/@comment-26526305-20170301210606/@comment-27219153-20170301220740

Dr Frankus wrote: Doctor who cares wrote: if I breed two horses of rohan in another biome (near harad, for example) will the baby horse have the stats of a rohirim horse or a regular horse? Breeding mixes the two stats of any horse.

So breeding two horses of Gondor in Rohan would have stats of the two gondorian horses, while breeding two horses of Rohan in a Gondorian biome will have the average stats of the two rohirrim horses.

The stats of the horse in a certain biome are only affected if it is spawned in. That's close, but you're a little off. When you breed two horses, the baby has stats equivalent to the average of the two parents and a random third horse. This random third horse's stats are capped at the vanilla maximum, and are often much lower. Thus, breeding two horses which have stats higher than the vanilla maximum, will always result in a horse with lower stats than the parents.