I was reading the thread below about when to start chicks on layer feed. Is mash the same thing? My local feed mill makes its own mash for 10$ per 100 lb. and right now I am feeding grower at $13 per 50lb.. My hens are 12 1/2 weeks old. 12 BOs and 12 Golden Comets. Should I keep them on grower till 18 weeks old, or can I switch to the mash. I am not sure what the mash is made from.