How much area do you have over there? Any predator problems?
We have 3 acres total - including some wooded area and a small pond. We've experienced a few losses, but that was when some of the chickens were younger and we're pretty sure that hawks had grabbed them when they wandered away from the group (they were entirely free-ranging - no fences at all). Sometimes we found a feather explosion, and other times the bird just vanished. Recently I built a 40'x80' fenced in area with 2"x4" horse fencing and since then we've seen nothing. Others in my area have experienced coyotes, but we're surrounded by about 100 acres of field and I think they're too shy to come across the field to investigate - I've never seen evidence of them at least. I have two acres that will be easy to fence in - and my plan is to built a semi-portable shelter that I can move around.