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I've gotten this link via email and comments at least a half dozen times today, and here's my reply:
I feed my 5 laying birds DuMoore scratch (mentioned in another article) and Producer's Pride layer feed, both from Tractor Supply, and am getting 3-4 eggs a day which is right at normal for their breed. Matter of fact, I just got back from town where I bought another bag of each.
If it is true and it's caused by a lack of protein, it's easy enough to boost that by throwing them some shredded meat scraps, diced hardboiled eggs or dried meal worms.
I actually stumbled across the article in another publication a few days ago and shined it on because I had just walked in with 4 eggs from 5 birds in my hands.
The Daisys have been fed Producer's Pride from Day 1, first the crumbles, then the starter, and now the mini pellet layer feed and I haven't seen a single issue because of it. They're cranking out eggs full speed.
My two older hens quit laying in late November as they've always done in the past, and I figure they'll start laying again in about another month.
I suspect the content in this article is nothing but internet bullshit. I may be wrong and trust me, if my hens suddenly quit laying, I'll let you know.