Thanks, that is good news, that a week should be enough. I can see myself wanting to minimize that time, especially if I am trying to set some eggs in response to a new broodie. I did not mean to hijack Nesting Hills' question. I would think that if the hen if free from prior matings, that you would not have to wait, maybe a day?I would say one week from what i have read. The new roo semen should be able to out power anything that is left. Dr. Bramwell at U of A says three days i think. I went off this last year and had mixed birds.