I've decided to take on horse breeding as one of my ''specialties''

I have questions about the mechanics of it all.
1 : Do I need as many males as there are females for all of them to be ''with foal'' ? I have 3 females and 2 males, the third female doesn't seem to get pregnant,
which would kind of defeat the purpose of studding, if all horses are monogamous

2 : Is there any proximity information somewhere? I know they are not really getting it on, so there has to be some sort of proximity rules.
3 : If I have a space that I use for my horses surrounded by palisade and divide it in 2, one side for general and one section to isolate 2 horses so only they breed together, will a roundpole
fence be enough to make sure only the 2 breed together?
4 : will 2 better horses always produce good offsprings, or is it like playing lotto?
5 : Not really breeding but, do feed-through feed through walls?
Thanx
