I don't think you would have a fertility issue with 1 roster and 16 hens. I have 1 rooster on 30 hens and actually have really great fertility. I find that the more roosters you have the worse the fertility because the roosters fight each other while they are trying to mate and it keeps it from...
Once you remove this rooster from his current pen putting him back in will be impossible the roosters will fight. Do you plan on keeping both roosters? If not I would just leave all the birds together keep the americauna rooster and get rid of the other then after 2 or 3 weeks collect the...