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This business about continuous feed availability has filtered down to us from the commercial business, mostly. Most people do not even know of this origin.
Chickens in tight confinement need to be hand fed, essentially, since they have no other way to obtain sustenance.
As a convenience to the keeper, and to ensure the birds get a controlled intake, keeping the feeder full meets the need.
(When you think about it, confinement rearing is the ultimate form of stewardship, since the creatures every need is catered to by the keeper.)
By contrast, it was common practice a hundred years ago to offer main feedings in the early morning, midday and afternoon. The rest of the time, the birds were on their own. The people who raised chickens this way, did so with great success. There are those today who still do.
To make it easier, we are told by today's gurus to keep the feeder full at all times, and there is nothing wrong with that. If you work, have a family, go to school and/or have other facets of your life besides tending to chickens (gasp!!
) then it is a satisfactory solution.
But it is not the only way. Water, on the other hand, is an essential and should be always available.
AS for supermarket greens, your point about chemicals is a good one. As for freshness, most of the stuff I see trimmed off produce is rejected on appearance, and is fine for chickens. Cut off the bruised or unsightly portions and they are fine. Whether any but the outermost portions are laden with chemicals is for you to decide, I suppose.
Sure seems a good way to utilize a resource that otherwise would go to rot.