Diet Changes and Age

[buckeyefever]

When should I start adding Oyster Shell to my girls diet? They are 12 weeks old and are currently finishing off a bag of Grower crumbles. They also free range, whenever they decide to come out of their coop.

Thanks for your help!

 

[buckeyefever]

Sorry, I thought I posted this in the "Feeding" thread...oops...Reposting there.