I have 6 laying hens and 2 light sussex roosters. My girls were taking too much abuse when the roos got old enough to start breeding so I moved my roos to a separate coop. Now the hens are happy and the 2 guys get along good and all is peaceful. I am not new to keeping chickens but I am new to keeping roosters. I would like to be able to enlarge my flock without buying from outside sources. My question is: How long do I need to leave a roo in with my hens to start getting fertilized eggs? Should I let him visit for several days at a time or once a week? Or should I just get more hens and leave a roo wtih them full time? Any advice would be much appreciated!