I have a flock of mixed ages and I'm wondering if it's safe to give them all layer feed now. We have a flock of 7 hens/pullets. Half of the flock is around 18-20 weeks old and the other half is around 14-16 weeks old. Three are currently laying and another one looks to be ready to lay any day now. The other three have a few more weeks to go before they start laying. They free range during the day and usually only eat about a cup of feed per day as a combined group. However, on rainy days when they stay in coop/run they'll eat up to 4 cups as a group. So I'd say most of their diet is free range. Given that some of them aren't 16 weeks yet, it it safe for them to eat some of the layer pellets for a few weeks before they start laying? Considering the fact that it isn't the main source of their food. Also, I've read about oyster shells, should be providing them with that as well? I've only had chick grit out so far and I've never seen them touch it. Perhaps they get enough grit from outside? I've seen them eating snails shell and all.