#outcrossing

[finahundar]

Cavalier/Japanese Spitz puppies from the Swedish Cavalier King Charles Spaniel outcross project. Six litters from the project have been born so far. Breeds used are Japanese Spitz, Danish-Swedish farmdog and Lhasa apso.

[amber-tortoiseshell]

Theoretically, how long (how many generations) would it take me to breed non ticked tabby Somali cat that still has that high ruffesing?? Also, how could someone do that??

(Be free to info dump me, that's why I'm here X3)

That's really hard to tell, rufousing is too polygenic to predict it, or at least for me. In theory, only two generations can be enough, especially if you start with an outcross that already has pretty good rufous, but more realistically, outcrosses are usually pretty close to standard and considered purebred again by the fourth generation - but that's only when every generation is crossed back with the original breed.

Here's how someone who works with sphynx described their outcross program:

F2 already has very sphynx-like conformation, and i couldn't tell F3 isn't purebred on my life. (Look at the head and ear shape compared to F1!)

However backcrossing here doesn't give back the dominant allele, so our case with the non-ticked somali would the more complicated: the F1 x Somali cross would give 50% homozygous and 50% heterozygous ticked (this should be visible on the phenotype, but i'd probably still test them to be sure). F1 x F1 would give 25% non-ticked but probably a less Somali-looking cat.

So let's say we do somali backcrosses for 3-5 generations, and by then we have some reasonably somali-typed cats half of whom carry non-ticked: i think, in theory, 25% their offspring would be basically a non-ticked somali.

But at this point, of course, this is still a very small gene pool. To widen it, every time we introduce a new somali, we'd have a "puffer generation" of heterozygotes that slows down the process.

[darkwood-sleddog]

Like no offense but if the bobtail boxer project can work so can literally any other outcross project.

[thelittlespanielthatcould]

I'm constantly finding out that CKCS health is even worse than I originally thought and it makes me so sad. They're incredible dogs, they're The Best Dogs, and I want them to keep existing! I do! But as sad as it is, I would rather see them die out than go on like this.

It's not okay that "heart clear" means "their hearts don't start failing until they're 6+ years old" when dogs their size can regularly make it to 16. It's not okay that their average COI is between 35-45%. It's not okay that reports of hip dysplasia, cancer, cushing disease, and epilepsy are becoming increasingly common.

Theyre my favorite thing. Kovu is my FAVORITE THING. But it's not okay.

[thelittlespanielthatcould]

Cavaliers were 'recreated' through crossbreeding in the 1920s, then 20 years later when all but 6 dogs died out during World War II they just. bred them all together instead of allowing Evil Outcrosses to taint the bloodline. And that opinion has not changed with scientific advances directly contradicting it.

Yearly echos and MRIs aren't going to open up a genetic bottleneck yall. Without outcrossing, cavs will be 'protected' into extinction. And these sweet, sweet dogs will continue to suffer for every month, week, day and minute it takes for that to happen. It's so stupid! It's so stupid and shitty and arbitrary and unfair.

[finahundar]

Norwegian Lundehund and Lundehund F1 cross

[botanytoo]

Mixed mating after the loss of self-incompatibility in a long-living perennial herb Flowering plants display an extensive range of adaptive floral forms, which are often correlated with their mating systems.