How long does a hen have to be with the neww rooster before she becomes fertile?

[poultrycrazy]

i have a blue split to lav silkie hen and right now shes with a black rooster but im going to borrow a lav split rooster and put her with him, how long does she have to be away from the old roo and be with the new rooster before her eggs are fertile with the new roster?

 

[centrarchid]

You can expect to see some eggs fertilized by second rooster starting day three after his introduction. Generally sperm for first male will be exhuasted by 28 days after his removal. Second males repeated covering of hen will swamp first males sperm making overwhelming majority of eggs laid after about 10 days being fathered by second rooster. Having geneitc markers helps greatly in determination of paternity.