UC Davis Havanese genetic diversity resource for breeders... - Havanese Forum : Havanese Forums
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post #1 of 14 (permalink) Old 04-12-2017, 09:26 PM Thread Starter
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Lightbulb UC Davis Havanese genetic diversity resource for breeders...

I came across this while doing some Havanese research and just wanted to share it since it appears as if it might be a helpful resource specifically for Havanese breeders:



https://www.facebook.com/HavaneseDiv...c_ref=NEWSFEED

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post #2 of 14 (permalink) Old 04-13-2017, 10:06 AM
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Originally Posted by smemft View Post
I came across this while doing some Havanese research and just wanted to share it since it appears as if it might be a helpful resource specifically for Havanese breeders:



https://www.facebook.com/HavaneseDiv...c_ref=NEWSFEED
Yup. I don't think you'll find many good breeders who aren't aware, and more and more are getting involved all the time.

The nice thing is that our breed is showing some nice genetic diversity... which is not true of a number of other breeds. We have to work to maintain that, though.
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post #3 of 14 (permalink) Old 04-13-2017, 01:17 PM
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Sonrisas Havanese ..."Autoimmune problems seem to be the biggest health issue in the Havanese, which is perfectly understandable considering that there were so few dogs used to rebuild the breed. Lack of genetic diversity increases the chance of autoimmune problems in any mammal and especially in dogs. "
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post #4 of 14 (permalink) Old 04-13-2017, 03:55 PM
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Sonrisas Havanese ..."Autoimmune problems seem to be the biggest health issue in the Havanese, which is perfectly understandable considering that there were so few dogs used to rebuild the breed. Lack of genetic diversity increases the chance of autoimmune problems in any mammal and especially in dogs. "
I agree that autoimmune problems are a big problem in the breed... possibly the biggest, though crooked fronts and bad patellas a re right up there too. (and autoimmune problems are on the rise in all breeds and mixed breeds, which means there is something other than JUST genetics involved) However, the UC Davis study is not showing that we have an excessively small gene pool... probably because our "foundation stock" was not all purebreds. Dorothy Goodale collected them based on phenotype, not with any for-sure pedigrees on a number of the dogs. Plus the addition of some eastern European blood that was probably not purebred, infant it is strongly suspected that some weren't Havanese at all. ...Add to that that the Havanese being added to the gene pool from Cuba are, genetically, not closely related to the "American Havanese at all, and as long as people are careful, we have a lot of genetic material to work with.

What the UC Davis study is showing, however, is that we ALSO can't tell for sure how closely related two dogs are in terms of their genetics, based on how closely related they are by pedigree. Two full siblings can have remarkably different genetics due to the genetic "roll of the dice" inherited from each parent, while two dogs who would appear, based on pedigree, to be a pretty good outcross, could have more genes in common than you would expect. The information coming out of UC Davis shouldn't be used as the ONLY way to determine whether a certain breeding makes sense, but it is certainly a useful data point to help breeders make sound decisions.
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post #5 of 14 (permalink) Old 04-13-2017, 05:05 PM
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yeeh Rita at Sonrisas is active in promoting this study. It's definitely worthwhile.
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post #6 of 14 (permalink) Old 04-13-2017, 05:40 PM
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yeeh Rita at Sonrisas is active in promoting this study. It's definitely worthwhile.
A lot of good breeders are getting behind it. The more people are involved, the better we will understand our gene pool.
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post #7 of 14 (permalink) Old 04-13-2017, 05:53 PM
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yes , for sure.

study... ". The fact that the IR and IRVD curves are very similar to each other indicates that Havanese still retain a great deal of the genetic diversity present in ancestral village dogs. Nevertheless, there are still a number of mildly to extremely inbred dogs in the population."
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post #8 of 14 (permalink) Old 04-13-2017, 06:16 PM
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ICB has an interesting tool for breeders as well ICB Breeder Tool - The Institute of Canine Biology
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post #9 of 14 (permalink) Old 04-13-2017, 09:30 PM Thread Starter
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Red face Quid pro quo...

Quote:
Originally Posted by krandall View Post
Yup. I don't think you'll find many good breeders who aren't aware....

- - -

I figured as much but just in case wanted to post anyway. I have an innate sense of equity and feel compelled to try to give something back to the forum since I have received such a benefit from the resources and information available from those that kindly take the time to post and help others here.

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post #10 of 14 (permalink) Old 04-13-2017, 11:48 PM
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yes , for sure.

study... ". The fact that the IR and IRVD curves are very similar to each other indicates that Havanese still retain a great deal of the genetic diversity present in ancestral village dogs. Nevertheless, there are still a number of mildly to extremely inbred dogs in the population."
Absolutely. Whenever you have breeders who do extensive line breeding to "fix" certain"desireable" traits you also take the chance of concentrating undesirable traits. We certainly have seen that in other breeds and other species. When chicken farmers focussed solely on producing chickens with bigger breasts, they ended up with birds where the roosters were so aggrssive that they could not be kept with the hens without killing them. That was sort of a dead-end breeding plan, pun intended.
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