Yes, Misty and Whiskers both moult hard, whiskers after she was broody for that 6 or 7 weeks, and Misty now, both are now laying only about 3 times a week now (when they lay). Both are mutts as far as I can tell.I just accept it as background noise. I do have to turn the TV up sometimes when it is very loud as it is right now.
Hattie would bust that theory. I don't think she laid an egg all year. Maybe one or two at best. She is going through her typical horrible molt again this year.
Daisy, the greatest hen ever, also busted this theory in the opposite way. She laid 360 eggs one year with her typical smooth mild molt.
I wonder if their data might not be tainted by only studying "production" chickens. I find a huge problem with studies focused only on those chickens that are being "farmed". They tend to not reflect what I see in "pet" chickens.
You are likely correct that it’s the ‘farmed’ chooks being studied. I will have to read this guide, sounds interesting.