The matter at hand isn't simply "I noticed MY birds laying has decreased." It's "I noticed my bird stopped laying, and so did all these other people's too, and based on our shared experience it seems to be linked to the brands of feed we used."
Nobody here is in a position to prove anything. People are just starting to voice what they're experiencing, and already you're here basically telling us to provide a peer reviewed study or shut our mouths.
Don't like the conversation, then stay out of the thread or don't engage. Personally, I'm tired of people like you who have the audacity to believe you can police our posts, speech, and what is allowed to be discussed.