smfarman
Crowing
Thank you that's a great help, I'll check out the genetics sectionI haven't dived in too deep, but my understanding is the Blue Plymouth Rock sex linked hybrid (goes by several TMs like Sapphire Gems, which I have) are a bit of a mysterious mix originating in Czech and the Blue Andalusion being used for the color. It is supposed to be sex linked with males having a yellow spot on the head like (barring gene in the males) however it's not reliable just yet because it's a new hybrid. The males do tend to be blue with some barring expressed. They do not breed true though.
The Plymouth Blue Rock is supposed to be a regular Plymouth Rock with Blue being the color. Like the Partridge, or white variety. Though I don't the history of how they brought in the color blue, but I think they breed true.
Because yours is Lav Orp X Barred Rock, it would probably need a name of it's own. Beyond that I'm not too familiar with the barring gene and how well it is expressed in F1 (first generation) crosses.
I'm betting though there are some good pages in the genetics section or in the articles because there are some very knowledgeable people here when it comes to genetics and setting the traits you are trying for.