What does this mean?

[The Poultry Peanut]

Blue Quail Belgian d'Anver Bantams are known as Blue Belgian Bearded d'Anver Bantams in the Standard. They have the same genetic makeup as Quail Belgian d'Anvers with the addition of the incompletely dominant Blue (Bl) gene that does not breed true.

Standard weight at maturity are male-26 oz, and hen-22 oz.


The blue (Bl) gene only has an effect on black plumage resulting in blue plumage when the blue gene is present in the heterozygous state (Bl bl). Other plumage colors are not affected by the blue gene. When blue (Bl bl) males are mated with blue (Bl bl) females, the ratio of colors produced is as follows: 1 black (bl bl), 2 blue (Bl bl) and 1 splash (Bl Bl) (white with a blue cast). Any blue variety ordered from Ideal Poultry may include chicks with black, blue or splash plumage patterns.

will it breed like the discreption of the blue gene or does it not breed true period?​

 

[Sonoran Silkies]

Blue is blue. As an incompletely dominant gene, there is a difference in phenotype between heterozygous and a homozygous birds, so no, it does not breed "true." However it is largely predictable.

It does not matter whether you are talking about a solid coloured bird or a patterned bird--if one or both parents potentially add blue to the geneset, the plumage that would be black is affected (or not) according to the particular blue gene alleles inherited.

My 2005 edition of the Bantam Standard lists both blue and blue quail as recognised varieties for the breed. There are separate descriptions for these two varieties.

So, a blue d'anvers and a blue quail d'anvers are NOT the same.

 

[The Poultry Peanut]

Cool thanks!