I have 6 1 hear old hens, my husband and I bought 7 new chicks back in January. We were told from the store that they were all pullets. They are 9 weeks old now and I'm pretty sure 1 of the 7 is a roo. How do we introduce him to the older girls bc they have never been around a rooster. We really didn't want a male but we are able to have them where we live, but this would be our first male!