I agree with the above on the answer being relative to the breed, the individual Roo, the hens and the situation. My pens range from 1:1 (those being place holders for exceptional Roos I can’t use right now) to 1:9. My bigger problem with fertility has been spoiled hens who don’t like their...
In my experience - which is limited with multiple breeding pens- the hens don’t appreciate their Roo being taken away. It becomes sort of a family group and when you break that up there could be consequences. Hence I leave my groups together if at all possible. The thing that allows that is...