I had to ask my husband because I wasn’t sure. They were in a pen with a Speckled Sussex rooster but then he moved them to a pen by themselves and cleaned them out for a couple of weeks before he put the Red Leghorn rooster with them and started collecting eggs. We have never had a hen to stay fertile by a previous rooster that long but I guess its possible?It's looking like... How long have those hens been separated from the last rooster they were around?