Cross-table 01:

Light cinnamon (W-1)

inheritance sex-linked

Mating hen 1
0-1 cinnamon
(c)
hen 2
0-1 wildtype
(-)
cock 1
1-0 cinnamon
(c)
1-0 cinnamon (c)
0-1 cinnamon (c)
1-0 wildtype ( /c)
0-1 cinnamon(c)
cock 2
1-0 wildtype
( /c)
1-0 cinnamon (c)
1-0 wildtype ( /c)
0-1 cinnamon (c)
0-1 wildtype (-)
1-0 wildtype ( /c)
1-0 wildtype (-)
0-1 cinnamon (c)
0-1 wildtype (-)
cock 3
1-0 wildtype
(-)
1-0 wildtype ( /c)
0-1 wildtype (-)
1-0 wildtype (-)
0-1 wildtype (-)

Comment:
We don't use the name isabel. Some birds have to kinds of melanin: eumelanin and phaeomelanin. When there is a total loss of one of this two, we speak about isabellism (Steiner, 1935). Parakeets have only eumelanin. This is the reason that the name isabel is not a proper name. The name cinnamon is in use today. For the Bourke we have to replace this by the name light cinnamon. The wildtype Bourke has already brown eumelanin. The "isabel" colour variety of the Bourke is a bit lighter than the brown wildtype Bourke. So we call him light cinnamon.

This light cinnamon colour variety of the Bourke has a sex-linked inheritance. Only the cocks can be split for this factor. Hens are never split. The light cinnamon Bourke has dark red eyes. To avoid sight problems we don’t mate cinnamon hens and cinnamon cocks.
What mating is giving the best result? Cock 2 x hen 1 gives cocks and hen cinnamon and split cocks. Cock 1 x hen 3 is very useful because it gives the possibility to bring fresh blood in the strain. But this combination gives only cinnamon hens, the wildtype cocks are all split.

Abbreviations:
(c) = cinnamon, ( /i) = split for cinnamon (-) = no mutation factor

Colour:
dark yellow = best choice, bright yellow = good choice

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Copyright 2004 by Bob Fregeres

E-mail: fregeres@bourkes-parakeet.nl

8/19/04