For how long does sperm prevail?

[Michele Bee]

“ Last year I sold off ALL of my roosters but my 5 Gamefowl  hens were still laying.  I collected a few eggs 2 weeks after the roosters were
gone......set them aside for a few weeks and then put them under a
broody hen to set on for 3 weeks.....and hatched a few chicks....2
months after the roosters were gone.

Kelly in Moxee"

That was another question I have been intending to ask. If I have a hen living with a rooster, how long (at least several months, I assume, but how many) must she be separate from it before I can put her with a different rooster and be certain that all the offspring will have been fathered by the second rooster?

[K M Edgar]

2 weeks is the "Golden Rule".

Kelly in Moxee