I've never paddock shifted chickens--I honestly only have ever had one chicken at a time, along with my ducks 8-12 ducks--but, 600
chickens on an acre seems like a LOT. It seems more like a "
chicken tractor" with a
fence. I'd also be worried about the social dynamics of that many chickens together. Would some get waaay too henpicked? How do you make sure the more dominate chickens don't hog all the food? That might be alleviated by having lots of places to hide in the paddock, and feeding the chickens with large
enough troughs or enough buckets that everyone can eat at once.
I tried looking up more info. I found this (
http://www.plamondon.com/wp/how-many-chickens-per-acre/):
Broilers have a short lifetime before butchering, typically around 6-8 weeks, while hens are kept for a couple of years. On our farm, we only raise broilers for about eight months out of the year, while we have hens year-round. So what with one thing and another, a broiler places a lighter load on the land over its lifetime than a hen does. By my calculations, you can probably raise 500 broilers per acre per year in daily-move pasture pens without much trouble.
So if broilers are easier on the
land than layers, and 500 of them getting moved daily is manageable, maybe 600 layers is too much?
It might also be good to seed some other plants in the paddock after they leave to add diversity to their diet. I found this neat
thread on forage plants for chickens
https://permies.com/t/845/critters/forage-chickens
For trying to have that many layers on that piece of land, I think you're going about it in one of the best ways. I tried to "shoot some holes" in your idea, but i'm afraid I just don't have enough knowledge/ammo! Hopefully someone with more
experience can take an aim at it