I have a mixed flock of 7 pullets & hens. The oldest are 19 months and the youngest are 5 months. When we introduced the younger girls, we switched the whole flock to chick starter and offered oyster shells. That all went well, but our local store is no longer carrying chick feed. I do have some layer pellets on hand though. Is 5 months close enough to feed later? The 5 & 6 month olds are not laying yet (three girls). TIA for advice.