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Quote: Yes, but the hen may already have an egg in the vagina with another egg falling into the infundibulum. It will take the sperm longer to reach it's destination than it will for the egg to continue on it's tract. This will cause the hen to not have a fertile egg until approximately 2 days...

averytds got it. Once a female is bred, I assume the eggs are fertile 2 days after the initial breeding. If the female is with other males before your chosen male, waiting 3 weeks before hatching any eggs by her will assure that your chosen male is the father of the chicks that you will hatch.

3 weeks (21 days) to 4 weeks is when you can be sure that the hen's eggs are fertilized by the current male that she is breeding with. But, I've always had the idea that if a male is repeatedly breeding a female and the male is fairly young but mature, his sperm will "flush out" the weaker sperm...