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Lavendar is based on the lav gene. It is a true breeding form of Blue called Self Blue, and is absent of lacing. When breeding lavendar you breed Lavendar to Lavendar you get 100% lavendar chicks. Many breeders cross Lavendar with Black, all resulting offspring are black, then breed those offspring back to each other to get back to lavendar. lavendar is often associated with poor feather width, and poor feather quality thus the occasional cross to balck to improve those traits.
Blue is whole different story.
Blue is a incomplete dominant mutation of Black. It takes two copies of genes to create most colors along with other determing factors but with blue for instance the natural form in a recessive state bl results in black when two copies are present, the mutation incompletly dominant Bl results in a splash when two copies are present and when the two are combined as Bl / bl you get Blue.
So to think of it this way when breeding Blue
bl/bl = Black
Bl/bl = Blue
Bl / Bl = Splash
This form of blue is laced with a darker shade of blue. One should breed for an even shade of blue. You will get your best color by breeding Blue to Blue and be able to maintain proper lacing and a more uniform color through out the birds body in this manner.
when Breeding Black x Splash all teh resulting offspring will be blue in color however will vary widely in color quality and are often un-even in color and begin to loose lacing as this created by the presence of other genes you cannot see when using Black and Splash.
Did that answer it for you or do I need to dig deeper or make it more simple?
