When do I switch to Egg Layer from Grower?

My blue cochins. When this picture was taken she was eating "Grower"
"When do I switch from Grower to Layer?"

I feed my babies "Starter" until about 8 weeks.

Then I switch to "Grower Mash" until they are fully "feathered out" about 20 weeks.

Next I switch them over to "Layer Pellet" I do not use "Layer crumble or mash".

I also mix in some:
Black Sunflower Seeds
Cracked Corn
Flax Seed
Mealworms
GameBird Pellets (higher in protein)

There are lots of ways to feed your birds. This is just one suggestion.