First a little basic genetic information. What is the coloration Sparviero in genetics ?
Every chicken have a gene from the "E-locus" (there is the original gene "e+" and 4 mutations "E" - "ER" - "eWh" - "eb")
For the Sparviero it should be :
- E-locus : E = Extended Black is the ground-coloration which is autosomale (for both sexes the same) : E/E (when "homozygote" = "pure).
That gene of the E-locus that every chicken have is always based on the "S-Locus" gene (there is the original gene "s+" and 1 mutation "S")
For the Sparviero it could be :
- S-locus : S = Silver is no red-pigment , s+ = NOT Silver is red-pigment (=gold) which is sex-linked (different if cock or hen) on which the ground-coloration is based on : S/S (pure Silver cock) or S/s+ (unpure Silver cock) or s+/s+ (pure gold cock) and S/- (pure Silver hen) or s+/- (pure gold hen)
To become the "barring-pattern" of the Sparviero we need :
- B-locus : B = Barring is the drawing which is sex-linked (different if cock or hen) : B/B (light cock) or B/b+ (dark cock) and B/- (dark hen)
(this was not the complete genetic story but enough basics to understand what is happening).
Now the cross that you made was "padre blu collo oro" X "madre sparviero grigioperla" .
We need to write this in genetics to can make the genetic-calculation for the colorations of your young cock.
(e+/e+ or eb/eb) s+/s+ Bl/bl+ X E/E (S/- or s+/-) B/- lav/lav . So your cock can be (E/e+ or E/eb) (s+/s+ or S/s+) (Bl/bl+ or bl+/bl+) B/b+ Lav+/lav
In common words he have an unpure black groundcolor based on pure gold or unpure Silver that unpure black diluted by Blue or not he have one barring allel and he his carrier of one lavender allel.
You want your young Sparviero cocks more lighter?
Do you intend the double Barring "B/B" ?
If so you can cross this young cock back on his mother because she have one barring allel
* so in the offspring you can become 25% of "B/B" light colored Sparviero cocks.
Do you intend the single Barring "B/b+" ?
Than the only way to become more lighter Sparviero cocks is by selection (there are always that are a little more lighter colored because of the quicker growing of the feathers and so become a weighter light barring what results in a visual lighter coloration).
Crossing your young Sparviero cock with a white hen have NO use because white have nothing to do with the light barrings in a Sparviero.
*
you can see the subtile barring lines in the tailfeathers of the motherhen.
[Modificato da Danny_57 09/01/2011 13:37]