Sorry, I may have said that wrong. I DID have them together only because I wasn't planning on breeding til Spring. When I decided that I wanted eggs now from my Black/Lav splits I seperated them and they've been in their own coop for about 10 days now by themselves. I was just saying that people recommend waiting 3-4 weeks after seperation to make sure that the hen is only fertilized by my split cockerel. I'm getting eggs from them now and my friend wanted a few chicks. What I was thinking was that if I incubate these eggs now, theres a chance that some....or all....or none, may be from the Blue roo (since its only been 10 days). I was just wondering if I'll be able to tell the difference at hatch so I can give her the "mutts" and me keep the pure Lavs. I'm not too worried about the Splits right now. So what I'm asking if I'll be able to tell the difference at hatch whether or not a chick is 100% Lav and not a Blue mix. Sorry for making this confusing. I don't plan on ever mixing my splits or Lavs with any other color than Black. This just happened because they were penned together temporarily. Thanks!