So my son wants to breed some of his chickens. Pens are under construction so that we can keep 1 roo with 3-4 hens. That way we can keep track of the off spring and the genetics backwards. BUT - they have been roaming all together for some time. So, how long does the chicken sperm stay in the hen? That is, for how long do the new pair need to be together before we can assume that the father really is from that rooster? Thanks!