How do you make a breed pure?

[Krys109uk]

like a pheasant naked neck hybrid cross

A pheasant X chicken is something completely different. I think people here have been referring to chicken X chicken.​

 

[chubakkalokz]

so can you give me an example with two different breeds?

 

[Krys109uk]

so can you give me an example with two different breeds?

I'm sorry; I'm confused. Do you want two different species or two different breeds of a species?​

 

[chubakkalokz]

Quote:
can you make a chart of two different breeds which will become pure? like a chart showing how they will become a pure line

 

[bigzio]

I'm not sure what you are asking here?
Are you talking foundation breeds in their relation to composite breeds?
New breeds can be created you know?

Composite breeds were developed from foundation breeds.

For example... Foundation Asiatic breeds are cochins and langshans.... the composite breed that is asiatic is brahmas, created from crossing cochins and langshans, until they bred pure and were excepted into the standard of perfection.

~ bigzio

 

[chubakkalokz]

Quote:
yes kinda like that, like a naked neck x silkie = F1, and from the F1 you cross it back to the father or mother, and continue inbreeding for 8 generations until they become pure?

 

[bigzio]

Yep, that's it....what a interesting choice of breeds to work with!

I'll need to see a pick or two of those.

Actually naked necks are a american foundation breed. They breed very true.
The cross will be quite unique. It will breed true after 8 generations, providing you stick with certain traits that are your goal.

`bigzio

 

[Krys109uk]

If you are talking about two different breeds of chicken one would probably need a computer to work out the possibilities.
For every gene pair one gene is inheited from each parent. Say, for example breed 1 has gene pair A/A for a certain trait he is bred with a hen of breed 2 who has gene pair a/a for that trait. The offspring will all inheit one "A" gene & one "a" gene thus all will be heterozygous A/C. Imagine that those offspring are bred together their possible offspring will inherit one gene or this trait from each parent. The possibilties would be A/A, A/a, a/A, a/a. Consider that these possibilites can happen for every gene in the organism & one can see that it far more complicated than could be put down in a table. Imagine crossing the grandchildren together, the genotype for each perent wouldn't be certain. Consider for just that one trait the possibilites increase exponentially in a generation given that the parents could be any of: A/A X A/A, A/A X A/a, A/A X a/A, A/A X a/a, A/a X A/A, A/a X A/a, A/a X a/A, A/a X a/a, a/A X A/A, a/A X A/a, a/A X a/A, a/A X a/a, a/a X A/A, a/a X A/a, a/a X a/A, a/a X a/a.

When one thinks about it even purebreeds are not actually "pure" or homozygous for every single trait.

 

[Krys109uk]

A breed can be said to be "a breed" when it looks like the specified breed & breeds true to type as no animal is likely to be homozygous for every trait.

ETA.....Judging by your other thread you are talking about cross species. I seem to remember Henk saying that when fertile for some reason, the genes from these hybrids, were only inherited from the female parent.