Hello all: So, I'm a relatively new chicken enthusiast--one year ago today I bought my first baby chick--and I won't lie ... I'm totally hooked. Raising and keeping a flock of chickens is the best thing I've ever done. In any event, now that I'm halfway through my third hatch from my own flock, and am learning about genetics a bit, I'm wondering if I may have stumbled upon a fun little sex link breeding formula for Easter Egger chicks; I'm not sure I've seen this suggested elsewhere, so I apologize if this is a repeat, but like I said--I'm new here. Ha. Some more info below. Here's the papa, a handsome Blue Wheaten Ameraucana cockerel (okay, so he's probably just an EE, but he's **** close to the SOP, if not on it), age 11 mos.; note that the photo's a bit washed out, but the shanks are slate/blue: (I love the lacing on his blue breast) Here's the rest of my flock at the moment, and from them I've only successfully hatched 8 eggs. 4 came from RIR's, 2 from a Gold Sex Link, 1 from a Gold Laced Wyandotte, and 1 from a Plymouth Barred Rock (all of whom, coincidentally, have nice yellow shanks): Of those 8 F1's, there are 3 from my first hatch (a horrible experience involving way cold incubator temperatures and an abundance of failure) including a crazy-fast developing Mahogany/White EE cockerel (whom I've named Captain Greentoe after the weird green spot on one toe on his left foot), a Blue EE pullet with some lacing, and a solid white EE pullet. Then there are the other 5 chicks, who are about five weeks behind the first 3, from my second hatch (a much better experience and hatch rate), including what appear to be 3 Mahogany/White EE cockerels and 2 Gold/Mahogany/Black EE pullets (they're basically twins). I've been patiently waiting for the clear signs of who's going to be what as far as sex is concerned, and as of today I can say I'm fairly certain that the above is an accurate distribution of male/female. If so, then what I've also noticed is that all of the pullets have green shanks and all of the cockerels have yellow shanks. I initially thought that this might just be a coincidence, but then I was looking into the genetics of shank color, and I think in actuality I'm seeing a sex linked trait play out in the birds' phenotypes. In other words, this is what I think I'm seeing, even if we're assuming a heterozygous combination wherever possible because I don't know for certain the genotypes of my breeding line: Blue shank male: (W, w - id, id) + Yellow shank female: (w, w - ID) = ___________________________ Yellow shank male: (w, w - ID, id) OR White shank male: (W, w - ID, id) OR Green shank female: (w, w - id) If that's the case, then I indeed have the ability to identify the sex of these EE chicks on day one after hatching. The difference in the shank color is stark, such that even a relative novice like myself can easily pick up on the difference between pullet and cockerel. And given the wide variety of yellow-shanked breeds that are also heavy egg producers, I could breed some really pretty, good-producing, sex-linked EE pullets with this strategy. Do I have that correct? Second, if so, why aren't hatcheries taking this approach over the traditional Gold/Red/Black sex-link routes? With the above formula, you seem to at least give the consumer a chicken with a great variety of plumage that also produce blue-green eggs ... right? Thanks for reading and answering! I'm excited to finally join in with a forum, rather than just reading them all!