UKC Forums - Coefficient of Inbreeding (COI)

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Posted by MRC on 03-12-2009 01:44 PM:

Coefficient of Inbreeding (COI)

Alright, someone with more expertise please fill the rest of us in on what it is and how we should use it in our breeding programs. To the best of my knowledge (and please correct me if I am wrong) but it is basically the probability of undesireable traits showing up in puppies based on the relationships of the ancestors??? A COI of 20% (0.20) or less is supposed to be desireable?

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Posted by Larry Atherton on 03-12-2009 02:34 PM:

MRC,

You basically have it down pat. It is a mathetical equation based on relatedness that calculates the probability of harmful recessives showing up in offspring of a cross.

Research and several authors such as Willis report that as breeders we should be targeting COI of 0.20 or less.

Now, if you are figuring it out long hand ... wow ... that is a chore. I have TBS software that calculates it for me.

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Posted by Larry Atherton on 03-12-2009 02:36 PM:

I will add that historically many of my crosses bounce right around 10-15% COI.

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Posted by MRC on 03-12-2009 03:02 PM:

Nope, I use Wincanis Pedigree.

Posted by mrbluedog on 03-12-2009 03:05 PM:

what about one that is 22%

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Posted by MRC on 03-12-2009 03:51 PM:

quote:
Originally posted by Larry Atherton
MRC,

You basically have it down pat. It is a mathetical equation based on relatedness that calculates the probability of harmful recessives showing up in offspring of a cross.

But wouldn't this also be the probability of getting desirable traits?

Posted by Oak Ridge on 03-12-2009 04:05 PM:

20% is not a "hard stop"....

Again, it is like any other inbreeding or line breeding factor. If your chosen line is prone to inheritable heath issues, when you get much of 20% COI, you are more prone to see those issues with some frequency.

It truly has no real bearing on the outcome of the hound in the woods....

It is a measurement, along with the size of the feet, the ears, or the bung.....it does not affect ability and talent, but is a significant driver to traits.....

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Posted by Oak Ridge on 03-12-2009 04:10 PM:

quote:
Originally posted by MRC
But wouldn't this also be the probability of getting desirable traits?

MRC....define "traits" a little more, then I believe it would be easier to land on an answer.

If you are talking about size, color, voice, length of ear....then YES...if you are talking about tracking ability....then my belief is NO....that is linked to ability and talent...which to a great degree are not inheritable, but are linked more to the "nurture" than nature.

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Posted by Whistle Pig on 03-12-2009 04:14 PM:

Coefficient of Inbreeding (COI)

Guess you're right, I've got one with a bung as big as a grapefruit. and he want tree a lick, all he wants to do is fight.

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Posted by MRC on 03-12-2009 04:44 PM:

quote:
Originally posted by Oak Ridge
MRC....define "traits" a little more, then I believe it would be easier to land on an answer.

If you are talking about size, color, voice, length of ear....then YES...if you are talking about tracking ability....then my belief is NO....that is linked to ability and talent...which to a great degree are not inheritable, but are linked more to the "nurture" than nature.

I should've made myself clear. Like you said, the COI should help predict the physical features (i.e. build, size, color) along with undesirable traits such as the susceptibility to physical problems (hip dysplasia, over bite, eye problems). Correct?

Posted by Oak Ridge on 03-12-2009 05:19 PM:

quote:
Originally posted by MRC
I should've made myself clear. Like you said, the COI should help predict the physical features (i.e. build, size, color) along with undesirable traits such as the susceptibility to physical problems (hip dysplasia, over bite, eye problems). Correct?

++

EXACTLY!!!!!!!

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