I've been lurking here for quite a bit, but since I am planning to dive headfirst into your lavender project, Trish, I thought I'd chime in because I also think the smokey chicks are fascinating.
So, do you think your adult roo that stayed slightly lighter than your blacks may actually have 2 copies of the smokey gene compared to your other 2 smokey chicks that turned black as they grew in their adult feathers? Reading the info above, 1 copy of the gene equates to smokey chick down, black adult feathering. But 2 copies of the gene equates to both smokey chick down AND smokey adult feathering. Since you actually HAVE an adult bird that is displaying a dark gray color, it seems to me that that roo must be homozygous.
I also thought about that but considering how few of them I hatched I thought it must be impossible that both the roo and a hen was carrying this.
I am thinking maybe the one that stayed lighter could have this smoky gene(?) and also be homozygous for Lavender
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