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I wait 3 weeks if you want to be sure.
I have had mixed chicks hatch after 7 weeks of being separated...
I've never mix breeds since then.
Sue
While I'm not doubting that this is possible, this is far from normal. I'd say it is more normal for a 2 week wait. Most trials show that 10-14 days is plenty. To couple with that is the fact that as a rooster mates with a hen, the newest semen is used first in fertilization, so if a rooster is actively mating with a hen, you should get almost 100% purity within only 2-3 days, but that is also a big if. As the older semen gets older, it goes away. No study that I have ever heard of has had fertility after a month with no exposure to a rooster and those eggs that are fertile after 3 weeks usually are not able to hatch due to poor vitality.
While they may have been mixed breed chicks, I would question these things: First, where did the starter/parent stock come from? It is possible that the birds that you thought were pure really weren't. You can get all kinds of stuff from blacks or whites that really aren't pure blacks or whites, etc. Second, it sounds like a jail break might be possible
Chickens have a way of jumping fences, digging holes and finding new hens. Stuff happens.
Anyway, 7 weeks is way too many eggs to waste. Use a good, fertile rooster and you could probably get away with 10 days no problem.
I wait 3 weeks if you want to be sure.
I have had mixed chicks hatch after 7 weeks of being separated...
I've never mix breeds since then.
Sue
While I'm not doubting that this is possible, this is far from normal. I'd say it is more normal for a 2 week wait. Most trials show that 10-14 days is plenty. To couple with that is the fact that as a rooster mates with a hen, the newest semen is used first in fertilization, so if a rooster is actively mating with a hen, you should get almost 100% purity within only 2-3 days, but that is also a big if. As the older semen gets older, it goes away. No study that I have ever heard of has had fertility after a month with no exposure to a rooster and those eggs that are fertile after 3 weeks usually are not able to hatch due to poor vitality.
While they may have been mixed breed chicks, I would question these things: First, where did the starter/parent stock come from? It is possible that the birds that you thought were pure really weren't. You can get all kinds of stuff from blacks or whites that really aren't pure blacks or whites, etc. Second, it sounds like a jail break might be possible

Anyway, 7 weeks is way too many eggs to waste. Use a good, fertile rooster and you could probably get away with 10 days no problem.