Horses are like most mammals (humans, too) and the unborn develop in a uterus.
Foal.
Foal.
A Foal
They copulate.
A foal is the offspring of a horse but if you must be more specific a girl baby is a philly and a boy baby is a colt.
A foal
mule
When a donkey and a horse breed, the offspring will be called a Mule. Due to the uneven number of chromosomes the offspring will be sterile.
That is a mule.
foal
To get a cow horse in the MO Creatures mod for Minecraft you must first breed 2 basic horses. Breed the offspring of these with a tier 1 red horse. Breed the offspring of this with a black horse and you will get a cow horse.
In a pouch mainly.