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I appreciate the heads up!Welcome to BYC! Trevor is beautiful, as are his future pullets.
I think you'll be able to introduce them at around 15 to 16 weeks. If you've never seen a rooster "romance" hens, be prepared. They make it look quite violent, but most hens enjoy a roosters company.
Also, be aware that your own relationship with Trevor may change. He will be more interested in the pullets than you, and he may even get upset when you handle them. If you have any problems, we are here to help.