Foghorn, I have 2 roos, Rocky & Ricky, in the same flock but I have 20 hens and they free range. Rocky is alpha and really goes after Ricky sometimes. I think the rule of thumb is 1 roo for 12 hens = good fertility. But, I think for your situation it's going to depend on the temperament of the...
Ok, got the camara charged on a day the sun came out! Shock!
Anyway, here are my roos:
This is Rocky the Barred Rock.
Ricky the Red Sexlink
And Bertram who is Marans. Actually my favorite of all my standard roos