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Old 11-13-2009, 09:33 AM   #1 (permalink)
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Default Explaining COI

Can someone explain COI and the importance of those numbers?
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Old 11-13-2009, 10:31 AM   #2 (permalink)
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COI is coeficiancy of Inbreeding.
Here is a statement that I found in the PHR

What does COI = 17.2%[10G,10F,400U,91C] mean?
COI is Wright's Coefficient of Inbreeding. It is a measure of how related the parents of the dog were. What is considered high or low varies with breed. Dr Armstrong's work showed that for Standard Poodles the average COI was around 15%. That means that for Standard Poodles low would be under 15% and high would be above. In general it is considered "safer" to have lower than average COIs, but that is no guarentee against inherited diseases. The codes after the COI are G - number of generations in computation, F - number of full generations found in the pedigree, U - number of unique dogs in the pedigree, and C - number of common ancestors for sire and dam.
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Old 11-13-2009, 10:34 AM   #3 (permalink)
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I think that too many folks are getting hung up on low COi and not testing Thinking that the low COI is a guarantee against health issues. This is not good thinking. COI is as all other things a toll that is good to use but no the Law in breeding dogs We ust alway refer back to the pedigree and what is behind the dog.
COI can very well be garbage in garbage out :( In other word typos and mistakes can be made.
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Old 11-13-2009, 10:38 AM   #4 (permalink)
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Many people believe that a low Coefficient of Inbreeding makes for healthier dogs and strong line breeding weakens a breeding population over time. While this is true for a total population, it is harder to say that it is true for an individual dog.

Linebreeding has its advantages. It cements characteristics in a dog (good and bad) and you have a higher chance of having a consistent litter where you know what you are going to get. When you out-cross, it is anyones guess what parts and characteristics a dog is going to get. Many people like to linebreed, cement qualities and then outcross to try and introduce new or different qualities.

Anymore it is most common to see a COI between 5-10 in most show/performance bred Poodles. When I start seeing COI in the 20s and above, it makes me go

You have to consider the overall health of the dogs in a pedigree. Did a particular dog have a reputation for producing healthy puppies and for living to a ripe old age? Well then linebreeding is not such a bad thing! I might be willing to see this dog 3 times in a pedigree. But..... 5+ times. Not for me.

Conversely, if there is a dog who died of Bloat at an early age or who was known to produce Addisons then I shudder to see him even once. I would take a pass if that dog appeared 2 or more times.
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Old 11-13-2009, 11:51 AM   #5 (permalink)
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So if you are looking at poodlehealthregistry and see a dog that's listed with both PRA and SA and the COI is 29%, you'd want to stay away from anything related to that dog?
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Old 11-13-2009, 11:54 AM   #6 (permalink)
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Originally Posted by KPoos View Post
So if you are looking at poodlehealthregistry and see a dog that's listed with both PRA and SA and the COI is 29%, you'd want to stay away from anything related to that dog?
A Dog with these types of health issue yes you would want to stay away from it no matter what the COI l.
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Old 11-13-2009, 12:01 PM   #7 (permalink)
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What's the highest COI number anyone's seen in a dog?
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Old 11-13-2009, 12:16 PM   #8 (permalink)
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Wycliffe Herald- 70.2 for 10 generations.
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Old 11-13-2009, 12:20 PM   #9 (permalink)
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Quote:
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Wycliffe Herald- 70.2 for 10 generations.
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Old 11-13-2009, 12:22 PM   #10 (permalink)
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Remember that setting type , whether it be color or establishing a breed standard requires quite a bit of inbreeding ..
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