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Discussion in 'General breed discussions & FAQ' started by chubakkalokz, Nov 4, 2009.
Like a pure blood line? i heard you have to inbreed but not too sure, anyone know?
I'm not sure if you are talking breeding true or what?
Grading introduces stock from another breed to the existing flock.
It takes 8 generations for the flock to breed pure. For example,
Generation fraction percent
1 1/2 50%
2 3/4 75%
3 7/8 87.5%
4 15/16 93.75%
5 31/32 96.875%
6 63/64 98.4375%
7 127/128 99.21875%
8 255/256 99.615375%
Hope this helps some way.
yes thank you that helps a whole bunch
wait so if you have two mixed breeds and you breed them for 8 generations they will become pure?
No, the example you were given is based on line breeding after an outcross. Take a line, cross in a bird from another line (different type). Take the F1s and cross them back into the original line. Then take the offspring from this breeding and cross them back into the original line, and so on for the succeeding generations.
If you take two different types and cross them together and continue to cross siblings from each generation. You may select for most of the genes that make it look like a particular type, but it will still contain many genes (traits) from the other line and would technically be a hybrid.
The first example above, is a good way to introduce a missing trait into an existing line. The 2nd is a great way to develop a new variety that has a mix of traits from both lines.
so you can never make a hybrid pure?
Please specify what you mean by 'hybrid' & "pure"?
like a pheasant naked neck hybrid cross
Quote:can you give me an example with two different breeds
yep, while grading is used to add vigor to rare breeds...this method can also be used to develop new breeds or re-create breeds.
Appropriate mates need to be identified to be certain where progress in the flock is headed..stud mating using the sons with desirable traits can be graded into the flock. Creating your own line of superior males.