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Date Posted: 21:30:17 03/07/04 Sun
Author: David I.
Subject: Open registries/closed studbook
In reply to: Melinda Proffer 's message, "Re: Open registries" on 09:08:44 03/02/04 Tue

Melinda:

"Because we need new and better testing methods to help unravel the HD issue, vaginal hyperplasia, entropion and ectropion issues with the breed."

ASFAIK all polygenic traits. (see my comments in the post below.) New testing methods are being developed at least for HD. It is very hard to breed away from everything at once. Knowing what genes cause some disorder is only the beginning it is like knowing a list of ingredients for a cake you still have to mix them and bake it at the right temperature particularly in polygenic and multifactorial disorders (like CHD).


We need to know how it is passed along from parent to pup.

We know, but it is much more complicated that a single gene disorder.

Yes I know there has been tons of research done with HD but not with Boerboels.
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Melinda, the research on HD is applicable to Boerboels. It really doesn't need to be repeated for BB.

I also want to know what makes this breed of dog live so long as compared to other large breeds that are dead at 8 years old like my American Bulldog Max. That to me is totally unacceptable.
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I agree it is unacceptable when you consider that wolves live to be 15-18 years in captivity, they are the same species, so the genetic potential for dogs to live as long is there. I would say this:

1. At the base of Boerboel genetics there is a great deal of diversity which properly managed makes for heterosis (hybrid vigor) and competent immune systems. In addition it seems that the founders had few deleterious recessive genes.

2.Even recently there have been introductions of other breeds into the breed. On the whole this has been a GOOD thing. This practice is not for backyard joe as any effort like this has to be multi-generational and carefully thought out.

3. Boerboels come from a harsh evironment and natural selection had been allowed to operate.

4. Many think that big dogs can't live a long time. Northern wolves 100-150lbs are long lived. Many landrace mollosser breeds, (livestock guardians) live to be 12 or more.

5. The Boerboel has only been relatively recently defined as a breed, even though there were boerboel/type dogs in SA for quite awhile.

There are challenges associated with having a closed studbook insofar as to maintaining the genetic health of a breed, especially a rare breed. But enough for now.

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