This mod that replaces the horse breeding algorithm. The default algorithm takes the stats from both parents and a 3rd random horse and combines them and then divides by 3. This has the somewhat realistic effect of making it exponentially harder to breed better horses, but it's quite awful from a gameplay perspective.
This mod instead creates the child horse with stats averaged from the parents and then applies linear variation to each stat and finally clamps it between the min/max values in vanilla Minecraft. It's still quite a feat to get a "perfect" horse, but at least now it's a goal you can work towards.
