I have two Production Reds I bought from a dairy/egg farmer earlier this year.
They are the BEST LAYERS!
These gals are only about 9 or 10 months old now, and they consistantly produce extra large or jumbo eggs. Until recently, they would go four weeks or more before they took a single day off.
Now, all of my hens are slowing up on egg production. But whereas my barred rocks, buff orpingtons, EEs and EE/barred-rock mixes are slowing down to just two or three a week, the two Production Reds are slowing up to only 9 eggs out of every 10 days.
One of my production reds, Brownie, produces a Hershey's chocolate brown colored egg that is almost always 2 and 1/2 ounces (a jumbo). Cinnamon, the other production red, produces a slightly lighter colored egg (more the color of cinnamon) that is almost always either 2 and 1/4 ounces or else 2 and 3/8 ounces (extra large).
Both produce extremely healthy eggs -- as long as I supplement their feed with boiled egg or old milk. Because they are heavy egg producers, they need to supplement their rations with high quality extra protein and calcium -- more than what the other hens need.
But since I make sure to give them a waterer full of raw milk at least twice a week, plus I give them boiled eggs to eat twice a week, they keep on producing those extra large/jumbo, extra high quality eggs every day.
(BTW, I have been told that chickens have trouble digesting store bought milk. I don't use store bought milk, I use raw milk I get from a local farmer. If you don't have access to RAW milk, then just feed your kids boiled eggs from time to time -- maybe those eggs that got dirty when it rained or they fell out of the nest or whatever...)