[Squires]

Last winter, my bucks were in a separate pen next to the does, sharing a fence. I have unexpected kids :help from this situation, so now my bucks are about 50 yards away from the girls in a COMPLETELY separate pen.

I get the impression that goats could easily breed through a fence (other domestic livestock do). Cattle panel fences, sturdy posts set 2 1/2 ft in the ground, and a space of about 10 feet between pens for males and females should do the trick.