Just my personal experience... I am seeing decreased laying from my hens. I noticed the decrease about 3 weeks ago. I've had chickens for 10+ years, so I know all about laying behavior and seasonal decrease in laying. This recent decrease is not like any I've ever experienced. I use Dumor layer pellets. Even through the shortest days of the year the last couple months, the laying had not decreased like it is now. My current flock is on their 3rd year of laying and they have never slowed to less than an egg every 3 days. I may have just had good luck not having a pause in laying, but I'm not used to this. In this day and age, in my opinion, nothing seems out of the realm of being a 'conspiracy theory'. I'm not ready to commit to the bad feed theory yet, but if this continues as the days get longer, I'm putting on my tin foil cap.