I haven't read everyone's posts yet, but we currently have 3 roosters and 2 hens running free in an 8-10 acre pasture.
The roosters have been out there for about 6-7 months or longer. (DH says 8-10 months which is probably right because they started crowing last Oct or Nov & went into pasture then) One hen, since around Feb of this year due to laying a wonky shaped egg constantly - possibly due to her limp from an injury as a pullet, and the other hen comes and goes out there as she pleases.
Ours roost in the barn, the same barn that the goats and horses use. When it starts getting bedtime, they go in there and roost on the stalls or indoor gate.
I have no clue why they never bothered to roost in the trees on the lower end of the pasture. They still do not get too far from the barn, cover only about half the pasture actually.
We have only lost one rooster, and that was by DH. The rooster did attack a baby goat. Why that one, we do not know. He never bothered any others. So that rooster had to go.
They love to eat with the goats at feeding time. It is hard to get them to leave the goats and eat their own food!
As far as fencing........I have no clue.........I think its 2x4 wire because the goat kids always got through the electric wire...... and out of 4 strands of electric wire, I think one maybe two are actually live. So we have double fencing around it all........and we have some sectioned off for our layers with hog panels.
Never have had a bird get into any of the fencing.
ETA: Our barn is never closed. The main hallway is open on both ends. We don't close those doors. On the left, each stall has a half door. On the right is the feed/tack room, a stall area closed off by a red farm gate (DH's brooder is in there) and then an open stall on the end.
Good luck with yours!