Hello my name is Casey and I am new to raising chickens. I have 5 known hens 4 white leg horns and 1 tetra brown. I Started with 6 each but ya know it's a learning process. They are approximately 10 weeks old. Looking for a rooster I obtained 7 more chicks 6 Rhode island reds and 1 Easter eager who are 4 weeks old. Also 3 known roosters black star sex link who are 6 weeks old. All chick's are together and doing well. They are in a large coup and are free range tho I do keep the smaller chicks inside. My goal is to narrow the flock to only hens and one rooster. It appears that besides the known hens of the 7 unknown 3 or 4 I think are hens. Some of them have larger crests and appear to be already getting wattles. Having said all of this I am open to advice on any matter but mainly wondering if I kept black star as my rooster with them being RIR crosses would they be able to fertilize the RIR eggs? My main goal is egg production but wouldn't mind breeding time to time. Thank you for reading. Thank you in advance for your advice.