Sometimes they can be 75% correct. Partridge Pennedesenca chickens are like that.Mine have been autosexing so far. I suppose it's possible it was a coincidence, but all the pullets have had thicker eye stripes and all the cockerels thinner eyestripes, like with the Dorkings. Here's hoping that's wrong, because as far as I can tell I have two pullets out of ten if it's true.
These are the two I'm sure are pullets so far. The brown Silkie x Cochin mix is a sexlink by skin color (dark skin = female in that cross) and the OEGB has those thick eye stripes. I really hope that that's right on her because she's my first black Silver Duckwing out of them!!
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I think out of the OEGBs that I got a whopping 3 Khakis and just one Fawn, which is supposed to be the most likely color out of them. The Khakis are super hard to tell the eye stripes on, so I'm holding off passing judgement on them, but based on behavior already I think the Fawn is a male anyway. He's a feisty little squirt for a 1-day-old! Then I got 4 white Silkie x Cochin cockerels (light skin = male). These guys are Buzz's full siblings, so the fact that the cockerels are white and the pullet is dark is just coincidental, at least.
I haven't gotten good individual pictures of them yet (the last two are still finding their land legs, so I'm giving them some time), but here they are having a party in their food dish
The 25% error rate will often get you more pullets and vice versa