@guest21 You will get 50% blue and 50% black chicks. Lavender is a recessive of black. Blue operates differently on black, so you'll get the same ratio of blue and black chicks as you would breeding a black roo to a blue hen. The chicks will all be split to lavender (carry lavender), which is fine is someone is looking for black split to lav chicks (which are needed for maintaining feather quality), but it's considered a no-no with blues. At minimum, if you did this breeding you'd have to tell people that the blue chicks are split to lavender (even though it doesn't work the same way as black split to lavender). It's complicated since the blue gene and lavender gene work completely differently.