That’s not true at all. Look up all the complaints about tractor supply feed. They have basically put birth control in the feed. It does not matter about the weather or the hours… I have raised egg birds as well as processed close to 200 meat birds. No one goes from having 3 dozen eggs to zero eggs.
You have mistaken unsourced, unverified, social media posts for data.
Not only is there no commonality in feed, brand, or type, there is also no chronologic or geographic commonality in reporting (you know, the things we expect to see in cases of disease, contamination, poisoning, or other efforts at mass adulteration). The few consipiracy-minded Youtube personalities have tested and found Nothing.
Further, it makes no economic sense - the feed business if FAR more profitable than the egg business. Margins are much higher.
Nor does it have a significant impact on the US food supply - even the US food supply of eggs. No one is "controlling" anything when thousands or even tens of thousands of backyard owners experience seasonal reductions in egg laying. Tyson had a bigger effect on the market when they
chose the wrong rooster. In this, we need to get over ourselves - its a nation of 330 million people. US commercial egg production involves a combined flock of
nearly as many birds, producing about 270 million eggs a day. Backyard production is a rounding error.
Moreover, there is almost nothing you can do to feed that will cause birds to stop laying that won't have other, obvious, health consequences.
The hormone treatments used to stop birds from laying for certain medical conditions (and also zoo population control) are far too expensive to put in feed, and are mostly injectable anyways.
And yes, plenty of people show massive drops in egg production - including 0 per day. My flock is in my sig, below. I'm one of them. and no, I don't feed Purina, or Nutrena, or DuMor, or Producer's Pride, or whichever else feed is being blamed on Facebook right now. Things have improved in the last couple weeks, owing to my more southern location - we've crossed the neede ddaylight hours mark, or close enough.
Now, if you want to believe that "they" (pick any they you want) have somehow maintained a vast conspiracy (in spite of widespread ineptitude in gov't and business for as long as there has been gov't and business) to do "something" (pick any something that fits your world view) by inserting some magical, undetectable, X into bird feed which has no other health consequences except to stop egg production, during a period when egg production normally slows or stops (particularly in older layers) with the effect of damaging a high profit revenue stream in order to improve a very low margin business thru damage to a "competitor" affecting maybe 1-2% of the total market, you are welcome to do so.
But i submit to you that, even if that were somehow (however implausibly) true, it is irrational. No competent, vast, consipracy of any duration would waste their time with such an obviously wasteful, inefficient, and low reward behavior.