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That test idea included SWITCHING BACK to the "bad" feed a few weeks later. I agree that switching once, especially as the days are getting longer, does not prove anything about the exact cause of the problem. But switching back to the "bad" food, while the days get longer yet, certainly might...

It looks like both: feeding Purina the whole time, egg production went down and then went back up.

I think it tells more with some results than others. If you switch foods and the chickens start laying, I agree about all the other things that could affect it. But if you switch back and they KEEP laying, I think that would be pretty strong evidence that the feed is NOT the problem. If you...

It happens to many hens, in many different years. You can go search the old posts on this forum. Every fall, there are lots of posts from people who are worried that their chickens stopped laying. It is not something new this year. Are you feeding all your birds the same feed? When the...

Doing your own experiment is a good idea. There are really two questions that have been debated at great length. The first question, is anything actually wrong with the feed? So far, there are reports of chickens that do lay better on different feeds, and reports of other chickens that resume...