for thenmost part I separate my chickens by breed and even color except that I have a buff silkie hen in with the nicer ameraucana roo, a silkie mix, a cornish and a cornish mix in with my other wheaten roo, and a silkie mix, a frizzle and two silkies in with my pure silkie roo. My trio of black ameraucanas are together, my trio of silver penciled rocks are together, and I have a trio of silkies together. The funniest thing is my best layers are my silkies! I even had one start laying last week she was hatched early spring of 2015 and has already laid five eggs!I'm not a breeder so genetics and breeding what to who is not my thing. It's interesting but I don't delve into it.
I found that to have a colorful egg basket with blue or green eggs I'd have to have at least 3 or 4 Amer hens to ensure some hens might be decent layers. However, I'm not zoned for more than 5 hens so I can't afford even one deadbeat layer (which is what I have now--one deadbeat). She's sweet and a kind flockmate and tame with us but a drag on our small feed bill. I will give her this coming Spring to see if she picks up laying or not and then decide what to do then. I have a rescue home for her but think she's too timid to be placed in a dual-purpose flock where she definitely will get bullied. It's either get bullied or go to the freezer and I don't have the heart to do either.