Because it only creates a tracking nightmare!
Only if you don't know how to keep good records.
and there are other issues.
Probably the most "controversial" topic as to using Blues to bred Lavenders would be the introduction of the pattern gene (Pg/Pg) to your line of Lavenders. Now, this does not mean that the resulting Lavender offspring would be laced like Blues. Rather, they would show faint signs of carrying the pattern gene, like you can see in a Black bird that is the result of a Blue breeding.
For example, you can see lacing in my Black hen's neck feathers here:
Lavender, aka "Self Blue", "self" meaning the plumage of the bird being entirely one solid color... the argument the opposition was using was that if Lavender birds carried the pattern gene, they themselves were then patterned (laced) and could no longer be considered "self".
Which is BS, IMO. My black hen above is Black, Self Black, no matter if she carries the pattern gene or not. The same can be said for Lavender birds who carry the pattern gene.
but since it creates a genetic nightmare
It will only create a "genetic nightmare" if you don't understand genetics.
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