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07-14-2013, 11:45 AM | #61 |
Donating YT 1000 Club Member | Really interesting subject brought about by the ousting of yet another bad breeder. I still cannot get over that she bragged about breeding merle to merle since even though I don't know much about genetics I do know how to use google. Although the article is over my head at times I found this & many others just by doing a google search of some of the terms used in recent comments above. Analysis of Genetic Variation in 28 Dog Breed Populations With 100 Microsatellite Markers
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07-14-2013, 12:43 PM | #62 | |
Senior Yorkie Talker Join Date: Feb 2012 Location: Ocean Beach, CA
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I don't believe we will ever find a perfect breeding world so my interest in sharing this information was intended for those that want to know more to improve the breed. My initial impression upon hearing about the Yorkie's amount of variant genetic material explained why we see so many different physical traits this breed. I left the conversation with the thought that some variant genetic material was good because we do not want to breed for the "perfect" dog. That would be just as bad. The objective is to find the right amount of variant genetic material. | |
07-14-2013, 01:28 PM | #63 | |
YT 3000 Club Member Join Date: Apr 2013 Location: Urbana, IL USA
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Last edited by pstinard; 07-14-2013 at 01:29 PM. | |
07-14-2013, 01:50 PM | #64 | |
Senior Yorkie Talker Join Date: Feb 2012 Location: Ocean Beach, CA
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Although this is a 2002 study there is still a lot of valuable basic genetic information for those that wish to read it. Thanks for sharing this with the group. This is another good read by Elaine A. Ostrander Ph.D. for those that may be interested in basic canine genetics. Both Ends of the Leash — The Human Links to Good Dogs with Bad Genes http://www.nejm.org/doi/full/10.1056/NEJMra1204453 Happy reading! | |
07-14-2013, 02:13 PM | #65 | |
YT 2000 Club Donating Member | Quote:
But what if the standard is set in such a way, that it actually breeds in, dogs with health problems at least structurally. I hesitate to mention this, but the BBC special "Pedigree Dogs exposed" published what 4yrs or so ago, albeitly terribly biased did raise some very important issues with the health and the breeding practices and standards for some breeds. It got so much press and exposure, that The Kennel Club, undertook a review of all Breed standards, and did "issue" changes to the standards for some breeds. Which is almost un-heard of for a registry to do; as it has always rested with the National Clubs to change breed standards. Overall you do need gene diversity, that does produce dogs with-in the standard. For otherwise the gene pool narrows, and you find yourself (breeding wise) in a cul-de-sac. I believe here in North America, although this is a very very unpopular view, with little support; that all Championships earned prior to two years old are provisional, and only finally granted after all health tests that can be done are done, and posted on the applicable health databases. In the beginning as long as you do and post the health results, then good breeders can scruntinize them, along with the pedigree information, and can make much better informed decisions. Eventually, when we get more and more genetic tests available to us as breeders, the health screenings for many breeds will become a moot point, if only clear to clear is bred. But there is more than just health screenings, there is temperament, attitude, coat, drive, and a whole host of breeding decisions that likely won't be able to be fixed on a particular genetic marker or two. These threads are so very informative!
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07-14-2013, 02:32 PM | #66 | ||
YT 3000 Club Member Join Date: Apr 2013 Location: Urbana, IL USA
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I'll have to take a look at the Ostrander paper... | ||
07-14-2013, 03:02 PM | #67 | |
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07-14-2013, 04:08 PM | #68 | |
Senior Yorkie Talker Join Date: Feb 2012 Location: Ocean Beach, CA
Posts: 109
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I agree that a breeder's goal should not be the 'perfect dog' and diversity is important to the health of a breed. I also agree that genetics will eventually address most health and physical problems within a breed. Testing will be available for all these dreaded conditions but we are probably a decade or so away from that even though genetics is advancing at a fast rate. The testing will also not be without error; it will be better but not perfect. | |
07-14-2013, 05:02 PM | #69 | |
YT 2000 Club Donating Member | Quote:
Perhaps you can post the link to a breed standard at UKC that includes health performance and agility with-in the standard. I agree that one should always breed to better the breed, and while our goal is the "perfect" dog it is a long ways off for any breed.
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07-14-2013, 06:42 PM | #70 | |
Senior Yorkie Talker Join Date: Feb 2012 Location: Ocean Beach, CA
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United Kennel Club: United Kennel Club, Inc. Announces Major Revisions To Its Breed Standards I did not mean to get too far off the OP original subject or hijack the thread but the UKC policy is good news for all breeds and keeps the parent clubs thinking of all aspects of the breed. Thanks for asking. | |
07-15-2013, 01:20 PM | #71 |
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07-15-2013, 03:25 PM | #72 | |
YT 3000 Club Member Join Date: Apr 2013 Location: Urbana, IL USA
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07-15-2013, 03:38 PM | #73 |
YT 3000 Club Member Join Date: Apr 2013 Location: Urbana, IL USA
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| Coat color DNA testing in dogs: Theory meets practice This article is behind a pay firewall, but it describes commercial DNA testing for coat color genes in dogs and has a table of alleles that have been tested for in various breeds, including the Yorkshire Terrier. Yorkies have been tested for the presence of "sp" (Parti color), "b" (brown), and "e" ("Gold Dust") alleles. The only problem is that these alleles have very specific DNA fingerprints, and they arose in other breeds. They could not have arisen spontaneously in the Yorkshire Terrier. |
07-15-2013, 03:44 PM | #74 | |
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07-15-2013, 03:55 PM | #75 |
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| This is all too interesting, very informative.
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breeding merle yorkies, genetic research, marlene dawn gruters, marlene gruter dachshunds, merle dachshunds, merle yorkies usa, unethical breeder |
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