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We started out with 7 roosters.
Then they started fighting each other.
So we picked 3 largest, to protect the flock.
Then they started killing each other.
So we picked the biggest one to reproduce and protect the flock. Then that bastard started attacking my children. DEAD ROOSTER!

You might try our system to protect your flock. We have 8 foot tall deer fence, then two strands of 10,000 volt electric fence around the bottom. So far our flock has only had to suffer the abuse from the roosters, and one American Kestrel. I move it around when they run out of grass.
When my kids want to they let them out if they are outside. We only have 9 acres not much land.

Yeah we let ours free range in the evenings.. We have 12 acres but it joins with 130 of family property.. So land isn't the issue for us. I've been thinking about fencing our land with a good goat wire fence to keep dogs out well that and i been thinking of getting some goats..