Should I switch to layer feed? I have one Roo

[rosemarythyme]

Finally, I'd like to have organic eggs, is this really possible using store bought feed?

Your eggs aren't going to be certified organic if any of the feed/snacks you've offered isn't organic, or if the land they're housed on/forage on isn't organic. But if your aim is "organic enough" for your own usage, then that's up to you how closely you want to follow organic practices.

 

[NatJ]

So far I have been feeding Dumor starter/grower and I have added crushed shell in a separate dish for them as well.

That diet is fine for chickens of all ages. No need to change anything

 

[GC-Raptor]

Yeah, I agree with NatJ. I feed a Non-Medicated Starter-Grower feed 18% to my 5 Pullets and 3 Hens year round with Oyster Shells separately.

If you feed Crumbles it's cheaper than an All-Flock feed. I don't have any Cockerels/Roosters.
Of course if you are raising Ducks an All-Flock/Flock Raiser or Duck feed is the way to go.
My chickens get through molt just fine with 18% Protein. Curly on December 5 below.

Curly on December 27.

I also give them Scratch Grains twice daily scattered in their pen. 1 Tbsp per chicken daily, 2 Tbsp daily during winter season.

GC