Hi everybody,
The bird above is the same adult male you can see in the link below from the FB forum, given by Chris to Deon, and who has already bread those stuning chicks. This is a DF Violet Dom Pied SB (or maybe a DF Violet DF Dom Pied Heterozygous Parblue2).
https://www.facebook.com/photo.php?fbid ... 850&type=1
This male phenotype is close to the phenotype of a creamino (Turquoise Sl-Ino) but I want to notice some particularities:
1. About the Dom Pied part: it produces an almost completelly white bird meaning that the pied type in SB and Dom Pied are very probably alleles of the same locus, and as comented by Paul, it represents an advanced phorm of Dom Pied, without melanocytes let in the skin in the homozygous birds (DF). We have seen in the past some DF Dom Pied birds showing a blue head (Chris could add some pics), meaning that some melanocytes are kept on the head, and thus, this would be a "less advanced" mutation ... although, IMO, they show a nice looking phenotype.
2. About the Parblue part: in this adult male psittacins are mostly concentrated in the saddle area. In Turquoise birds showing a saddle, psittacins spread to the wing at sexual maturity producing the wing patches which are the areas with the highest amount of psittacins. This is remarkably noticed under uv, and is similar for other species of psittacula (Ex: Psittacula eupatria). At the time of sexual maturity Turquoise birds also show an increase in head yellow psittacins and a red ring. In SB, the parblue component seems to have lost the increase in wing, head and ring psittacins induced by sexual steroids at sexual maturity (have a look at Deon's male above), and the highest amount of psittacins remain on the saddle area.
I think this is a major difference with Turquoise birds:
the lack of regulation of psittacin expression by sexual steroids.
It has been detected a different fluorescence between head and wing psittacins in wild birds and lutinos under specific uv ligth (395 nm) as you can see here:
It would be interesting to have a look to the saddle psittacins of SB and Turquoise birds under uv looking for differences, since SB psittacins have been described as deeper, richer and brigther.
Regards
Recio