This may be a very silly question, but I still feel quite new at all this bird business. If I have 4 pens of chickens, can I let them all out at once to free range? I have a tractor of 6, a tractor of 5, and 2 pens of 2 each. All hens except 3 roos. If one roo would serve the whole flock, I could get rid of 2 roos. Thanks for helping a novice.