can someone tell me how long a roosters sperm can remain active inside a hen. I got rid of my Sussex and Plymouth Rock rooster about 6 months ago. I then only had a golden laced Wyandotte rooster, I then incubated these little beauties, all crossed with an Isa Brown, but clearly there is 1 young Plymouth Rock X rooster and 2 Sussex X hens in this picture.. These pulleys are only about 11 weeks old. How the crap did this happen?