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Most black birds that I'm familiar with (jersey Giant, copper Marans, Cochin, etc) hatch with white bellies.. and some (Marans) deal with what they call parasitic white fluff.. in their rooster tails etc.. *maybe* not the same thing as "leakage". This is my novice reply which doesn't answer your genetic questions.. but perhaps still worth discussing.What would cause this?
I don't think there is any specific cause, just that she does have a bit of white there. It happens sometimes with black chickens.I noticed she has a single white spot under her wing, what would this make her coloration? Black w/ white leakage? What would cause this? White Cochin somewhere in her bloodline?
Her chicks might have the same amount of white she does, or slightly more or less. But they should not have large amounts of white unless they inherit it from their father (barring in your example, or white if you breed her to a White Leghorn, or something like that.)Thank you!! I’m not trying to breed them a specific way but I wanted to make sure while hatching her eggs in the future, i shouldn’t expect any white (unless it’s from the rooster who is a barred mix so his would be 50/50 barred)
I never knew that! I’ll check her under fluff today! That sounds like it would be itThat looks to me like it's just some of her underfluff showing, like maybe she'd just flapped her wings and her feathers are a bit ruffled still. Black Cochins and other solid black varieties very often have paler underfluff compared to their exterior feather coloring. My Black Cochin bantams have a similar pale patch there if I lift their wing to look at their underfluff there.