Please go read all the threads on this instead of starting a new thread.
Not one person on social media ran tests on the feed, just their mouths.
Most chickens who have been "poisoned" are covid chickens who reached 2 and 3 years old, so they don't lay their second or third winter or they've reached henopause. chickens stop laying for late summer molting, go into winter break and wait for
needed 14 hours of daylight to lay. It's been unusually dark and cold this winter everywhere.
If you want to mix your own feed, this is a great place to research that but what is the approximate analysison your mix? It's hard to come up with a decent feed, especially if your source the recipe off the internet.
Imo, 16% layer isn't good enough for your modern dual purpose hens.
Tldr, nothings wrong with the feed, just tinhat Tony and homesteader Barbie who never bothered to educate themselves on the reproductive process in chickens blaming the feed for normal breaks in the lay cycle and running their fool mouths.
It's been dark, too dark to activate the pinal gland that controls laying, your hens were likely molting and taking awhile to come out of it as 16% protein isn't enough period, let alone during the molt. Find a good 18-20% feed.
First & third posts in this thread:
"
https://www.backyardchickens.com/threads/feed-tests-more-results.1565804/
This thread, posts 6, 10, 12, 14, 18, 22
https://www.backyardchickens.com/th...en-feed-craze-posted-testing-results.1564737/
Post 581 of this thread (I think this link will go straight to it; same feed as the one just above)
https://www.backyardchickens.com/th...-to-be-analyzed.1561749/page-59#post-26554912
This is the thread comparing feed labels (spoiler: not much changed.) The labels are sprinkled throughout many pages, so this one isn't a quick read. I doubt your client will care about this one, as she probably assumes they changed the feed but not the label.
https://www.backyardchickens.com/threads/current-internet-theory.1561604/
As regards your client wanting something "better" for her chickens, maybe suggest that she try a particular kind of other feed. For example, "maybe you should give your hens chick starter instead, with a separate dish of oyster shell. They wouldn't bother to add an anti-laying ingredient to chick starter"