Quote:
Not quite,
PAxPB=F1
F1xF1=F2
F2xF2=F3
PAxF1=BC1A
PBxF1=BC1B
I prefer in a back cross to use the F2 or F3 and only go back to PA or PB for additional color which ever carried the color I wanted. By making selections through at least 2 generations and preferably 3 I can select for Type, then Type, Then Color, then back cross for Color, then go back to the F2 or f3 for type again.
Could you explain that a little more fully?
lets say we have two birds, one the color or variety you are working on with type problems PA), and a very well typed line of another variety (PB).
Make the variety cross PAxPB=F1 generation. this was done to introduce type while ultimately looking for the color of PA.
Select only for type in the F1 birds, those showing some improvement that you are looking for. Cull all others.
Mate F1xF1=F2. You will get some even better typed, some that look like your F1 birds and some of each parent variety. Select the birds showing the most type improvement and demonstrating some or all the color traits of PA.
If you get very typey pullets with most of teh traits you want in the F2, then you can use the F2 Pullets under the male PA to get back more color traits but will loose some type from the PA bird that is not improved.
PAxF2=BC1AI
like to run an additional pen or two with F2xF2=F3.
I like to run to at least the F2 generation before making a back cross for the color, even then I only make that mating for a good cockrell to go back over the F2 females that will reinforce the type while working back to color as well.
BC1AxF2.
That allows for the following mating in the 4th generation
BC1AxF3.
Then you will have selected the F3 for type in F1 birds, Type and some color in F2, Type and some color in F3. The BC1A will have more color and improved type but not as good as the F2 or F3 birds. use the BC1A to bring in teh additional color with type from teh F2 and F3 birds.
So the breeding for type improvement looks like this.
Year 1 PAxPB=F1
Year 2 F1xF1=F2
Year 3 F2xF2=F3 and PAxF2=BC1A
Year 4 F3xBC1A and BC1AxF2,
Year 5 Take pullets from each breeding and mate to cockrells from teh other breeding, after selecting for type and color both.
