By Archie Klondike
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Additional info for Dog Trick or Cat Treat: Pets Dress Up for Halloween
On the back, the lipochromic ground color was remarkable, different from the common Isabelle. In the Brown canary, this new mutation became particularly different, in such a way that provided the name to this new mutation in the canary. The ground lipochrome color is delicately blended with the pheomelanin, just like as it is in a pastel painting, therefore, the name pastel. The lines or streaks on the back and flanks are almost imperceptible, and the canary shows that same blending of lipochrome and melanin, all over the plumage.
This is the result of environmental factors, conclusively nutrition quality. From a genetic basis the parents only provide the offspring with genes responsible for the proper assimilation of certain pigments, the transformation of those plant pig24 Fundamentals of Color Genetics in Canaries ments into animal pigments, and finally the onset of these in the feather structures. If a bird is not properly supplied with a diet rich in beta-carotene to be transformed into red lipochrome, but is supplied with xanthophylls, then yellow lipochrome will be deposited in its feathers.
A portion of this formula has been previously explained in the chapter dealing with white canaries and in the chapter about yellow canaries, all these genes are also common in the red factor canary. The red factor canary genetically needs to bear the K gene to normally assimilate the carotenoid substances, plus the G gene in order to transform these substances into yellow pigments. If the red factor canary would bear the recessive g gene in heterozygosis condition, a proportion of the brood would be homozygote for that allele, and this is only possible in theory, since the recessive german white canary has never been obtained; it is only and exclusively a theoretical possibility, as has been explained somewhere before in this book.