Cross-table 52: opaline-fallow, sex-linked and recessive

Developing the opaline-fallow colour variety

mating first year hen 1
0-1 fallow
(f)
cock 1
1-0 opaline
(o)
1-0 wildtype (/o/f)
0-1 opaline (o/f)

1. First year:
We choose two pairs, two combinations of an opaline cock and a fallow hen. We need two pairs to avoid to narrow genetic relations when we mate the offspring.
Combining a opaline cock with a fallow hen is better than a fallow cock with an opaline hen because of the sex-linked inheritance of the opaline factor. Results are wildtype cocks, double split and opaline hens, split fallow.

mating
second year
hen 1
0-1 opaline
(o/f)
cock 1
1-0 wildtype
( /o/f)
1-0 opaline-fallow (o+f)
1-0 opaline (o/f)
1-0 opaline (o)
1-0 fallow (f/o)
1-0 wildtype (/o/f)
1-0 wildtype (/o)
0-1 opaline-fallow (o+f)
0-1 opaline (o/f)
0-1 opaline (o)
0-1 fallow (f)
0-1 wildtype (/f)
0-1 wildtype (-)

2. Second year:
We mate the double split cock from one pair with the opaline hen split for fallow from the other pair.
Results: opaline-fallow cocks and opaline-fallow hens. Our goal is reached. The percentage of this new colour variety is very low so we must have patience and a bit of luck.

mating
third year
hen 3
0-1 opaline-fallow
(o+f)
cock 2
1-0 wildtype
( /o/f)
1-0 op-fallow (o+f)
1-0 opaline (o/f)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
0-1 op-fallow (o+f)
0-1 fallow (f)
0-1 wildtype ( /f)


3. Third year:
Use the the split opaline, split fallow cock and the opaline-fallow hen. With this choice we avoid chance of splits and combinations of red eyed birds.
The result is again opaline-fallow, cocks and hens. All the offspring we can use in further developing of a strain.

Abbreviations:
(o) = opaline, ( /o) =split opaline
(f) = fallow, ( /f) = split fallow
(o+f) = opaline-fallow, ( /o/f) = split opaline and split fallow
(-) = no mutation factors

Cross-table 52: opaline-fallow, sex-linked and recessive

All possible combinations

mating hen 1
0-1 op-fallow
(o+f)
hen 2
0-1 opaline
(o/f)
hen 3
0-1 fallow
(f)
hen 4
0-1 wildtype
(/f)
cock 1
1-0 op-fallow
(o+f)
1-0 op-fallow (o+f)
0-1 op-fallow ( o+f)
1-0 op-fallow(o+f)
1-0 opaline (o/f)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
1-0 fallow (f/o)
-
-
0-1 op-fallow (o+f)
0-1 fallow (f)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
-
-
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 wildtype ( /f)
cock 2
1-0 opaline
(o/f)
1-0 op-fallow (o+f)
1-0 opaline (o/f)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
1-0 op-fallow (o+f)
1-0 opaline (o/f)
1-0 opaline (o)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 opaline (o)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
-
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 wildtype (/f)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
1-0 wildtype (/o)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 opaline (o)
cock 3
1-0 fallow
(f/o)
1-0 op-fallow (o+f)
1-0 fallow (f/o)
0-1 op-fallow (o+f)
0-1 fallow (f)
1-0 op-fallow (o+f)
1-0 opaline (o/f)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 fallow(f)
0-1 wildtype (/f)
1-0 fallow (f/o)
1-0 fallow (f)
0-1 op-fallow (o+f)
0-1 fallow (f)
1-0 fallow (f/o)
1-0 fallow (f)
1-0 wildtype ( o/f)
1-0 wildtype (/f)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 fallow (f)
0-1 wildtype ( /f)
cock 4
1-0 wildtype
(/o/f)
1-0 op-fallow (o+f)
1-0 opaline (o/f)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
0-1 op-fallow (o+f)
0-1 opaline (o/f)
0-1 fallow (f)
0-1 wildtype ( /f)
1-0 op-fallow (o+f)
1-0 opaline (o/f)
1-0 opaline (o)
1-0 fallow (f/o)
1-0 wildtype ( /o/f)
1-0 wildtype ( /o)
0-1 op-fallow ( o+f)
0-1 opaline (o/f)
0-1 opaline (o)
0-1 fallow (f)
0-1 wildtype ( /f)
0-1 wildtype (-)
1-0 fallow (f/o)
1-0 fallow (f)
1-0 wildtype ( /f)
0-1 fallow (f)
0-1 opaline (o/f)
0-1 wildtype ( /f)
1-0 fallow (f/o)
1-0 fallow (f)
1-0 wildtype (/o/f)
1-0 wildtype ( /f)
1-0 wildtype (/o)
0-1 op-fallow ( o+f)
0-1 opaline (o/f)
0-1 opaline (o)
0-1 fallow (f)
0-1 wildtype ( /f)
0-1 wiltype (-)

Results:

The best combination: cock 1 x hen 2 and cock 2 x hen.

Good combinations are: cock 1 x hen 4, cock 2 x hen 3, cock 3 x hen 2 and cock 4 x hen 1. In this combinations there are no splits, all young can be used for developing the strain.

Remarks: Many years are needed to build a good strain of opaline-fallow Bourke's. Very important is the choice of the first opaline cocks and fallow hens. They count for many qualities of the strain. THe red pigment factor of the opaline is important. Intensity of the red colour, extending of the red pigment in back, wings and tail is important. Developing a strong and good coloured strain needs selection from the beginning.

In the cross-table we see that the quantitative relation between opaline-fallow cocks and hens is 1:2. This is due to the sex-linked inheritance of the opaline.

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Copyright 2004 by Bob Fregeres

E-mail: fregeres@bourkes-parakeet.nl

8/19/04