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Sorry for the extremely late reply, I don't hang around here much during winter months.
1. Foraging: They forage much more than a cornish x. They forage much less than a classic egg-layer. They would much rather eat the feed than to walk around eating other things, but that doesn't mean they are not more active than a cornish x. They definitely like to wander around. From perhaps 8 weeks on, I think it's nice to let them wander a bit outside the pen.
2. FR's are meant to "range". So, closing them up in a pen could be seen as the "wrong" way to raise these. Nevertheless, I do recall a very disappointed series of posts by someone who let hers range all of the time. She had very low weights on her FR's. I kinda like the way I did it. Keep them in the pen until they are 8-9 weeks, then give them occasional free-range access. They won't wander very far. Certainly, that's less "kind" to the chickens, but at some point, we have to realize that we're raise them for meat, and if they get too much exercise, they will be lighter, and cost more to raise.
3. PPP is my favorite chicken book. Having said that, I really question the concept that meat chickens can forage for some of their calories and result in a lower FCR (feed conversion ratio). If anything, I think having the chickens walk around foraging will result in a higher ratio. But, having FR's follow behind the cows is certainly nothing that I've ever tried, so I would really like to hear the results of this experiment. If you could lower the FCR to something close to the cornish x, that would be quite a feat. I say, give it a try, but remain cautiously optimistic.