Violet blue wildtype

Description: The picture shows a cock. The plumage is much darker than the normal wildtype. The eyes are dark. The bill is black. The change of the colour is clearly seen in the blue parts of the plumage. The best indication forms the under tail coverts. The original wildtype has very pale blue coverts. In the new colour variety they are violet blue. The other blue feather field of the head, throat, bend of the wing, primaries, and middle tail feathers are violet also. Besides there is an extension of the blue parts as a result of the blue structure factor. The frontal band is broadened and continues above the eye. The cheeks, who are scaled rose are scaled blue. The small and middle wing coverts are greenish. The wing bend is violet. The rump is very striking violet blue with an extension on the lower back. The under tail coverts are shining violet. The middle tail feathers are blue violet. Close ups and pictures of feathers can make this clear.

Close ups

1. throat and cheeks

2. shoulder and flights. There is a marked extension of the blue areas. The cock shows also a greenish violet colour of the margins of the wing coverts.

3. bend of the wing is deep violet.

4. rump and lower back are violet

5. Under tail coverts On this picture only a part of them are visible but the feathers are deep violet.

The best indication of this violet colour variety is the colour of the under tail coverts. Remarkable is the fluffy part of the feathers with a lot of melanin. The shaft and the dark kernel of the feather shows melanin too.

Under tail coverts violet

Development: I had dark Bourke's for quite a long time. The first Bourke who had the dark factor was a yellow pastel cock. He was so dark that you had to control the colour of the eyes as an indication that it was really a pastel. But this bird was born as a normal yellow pastel After the juvenile moult he became so dark. The red eye colour did not change. Paired with a wildtype hen he delivered dark young. This dark colour was spreading very fast in my strain of Bourkes.

Today the change is also found in some blue Bourke's. I have some dark birds with cobalt blue but also some violet blue. To show the differences I present a picture of a cobalt blue wildtype cock.

Cobalt wildtype

This cobalt blue wildtype cock is bred from a combination of a blue opaline hen and a split for blue wildtype cock. The extension of the cobalt colour is comparably with the violet blue wildtype. When we compare the under tail coverts we can see the difference.

Under tail coverts cobalt

Comparison under tail coverts:

cobalt, violet and normal pale blue

The comparison of the under tail coverts gives the best indication of the differences between normal (pale blue) cobalt and violet blue. The difference of colour plus the difference in melanin is a striking feature.

Under tail covert wildtype

Name giving: The name that typifies the two colour varieties is in my opinion: cobalt wildtype and violet wildtype. Both are new varieties in the blue series. We have to realise that the Bourke has a lot of melanin in the medulla and the cortex of the feather barbs. The eumelanin in the cortex count for the heavy undulation at the breast and wing the coverts. The wildtype has but little blue is some feather fields. By extension of the blue structure the blue areas were extended to feathers that hadn't a blue structure before.

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Copyright Bob Fregeres

E-mail: fregeres@bourkes-parakeet.nl

11/15/04