I have 5 guineas that were hatched a few days before mothers day. I have two that are at least 5 months old. I have them on 20% chick starter/grower. When can I reduce the protein? They free range all day and coop at night. I am sure they are getting a lot of protein during the day. I was also told that two of the guineas were called "giant" guineas. They are huge compared to my others, nearly the size of a turkey. The two "giants" cannot fly. Has anyone heard of "giant guineas?"