We had set back in Stud dog that we was going to use so having looking at others that will compliment each other one dog that i found is show ( so both dog & bitch are show dogs) i did the mate select test  result   12.5%
Result Breed
The Annual Breed Average inbreeding coefficient for this breed is 7.6%

Sire: ??
Dam: ??
Any puppies from this mating would have a coefficient value of 12.5%
The COI calculator provides you with a percentage score; the lower the percentage, the lower the degree of inbreeding.
Therefore, an inbreeding coefficient of:

0% indicates a dog that comes from two unrelated parents, based on all available pedigree information
12.5% would equate to the genetic equivalent of a dog produced from a grandfather to granddaughter mating
25% would equate to the genetic equivalent of a dog produced from a father to daughter mating.

Inbreeding can be accumulative, so if it has occurred to a significant degree over several generations, the inbreeding coefficient may exceed 25%.
Question  do you think it's to high COE as its spot on the 12.5%, ,  Thanks

> Inbreeding can be accumulative

Indeed and this is where, for me, the 'art of breeding' comes in - knowing when too much line-breeding has been done, and when an outcross is needed.    Most of my matings were done based on type, especially when leaving this country for overseas where line-breeding was pretty much not possible.  Once back here I tried to find the lines my foundation bitch went back to to use, but was only able to pick up some, way back.    So the first couple of matings were pretty much outcross matings, the only real connection being via the American/Canadian lines I bought back and American imports years back.   At that point I did two matings, one uncle to niece and another aunt to nephew (in house matings) because I needed to see where I was.

Coefficient information can be useful, but overall I prefer to see what I have, and the animals I hope to use, coupled with first-hand knowledge of those animals.   And whether they excel in areas I need to improve in my lines whilst maintaining the good I have.

Thank you for your reply i was going to mention outcross etc , But didn't want to go to much at this point , so thanks

12.5% is what you would get with a half brother to sister mating if no other relatives in common.

I have done such a close breeding twice, but would only do this in a situation such as the last where the common parent was my own bitch, who had three adult litters of healthy offspring (and was 9 years old herself by then) and the sires were imports from different continents, even so the COI was 13%.

The bitch that was mated to her half brother was also 5 years old by then with one healthy litter behind her.

I would not want such a high COI where I was doubling up on dogs I didn't know personally their health temperament longevity fertility etc.

In general, population genetic advice is that you will start to see the negative signs of inbreeding once you go over 10% and are best to try and stay below 5% if you can.

What's the EBV for this hypothetical mating?

Thanks you for you response i have only been checking for those studs that i feel will compliment my bitch  i have found  different stud dog
Result Breed
The Annual Breed Average inbreeding coefficient for this breed is 7.6%

Sire: ?? ( imp )
Dam: ??

Any puppies from this mating would have a coefficient value of 6.6%

Does it depend on the breed?
In my breed, the average is currently 17.3%. The number of stud dogs worth using is very small in number.
I do use the co-efficient calculator but the choice of dogs is very limited.

We have very few available stud dogs but we have an average COI of under 4%, but because of the low numbers (last few years only 50 - 75 registrations per annum) we import regularly so a lot of pedigrees will only be complete for 4 generations.

My first litter was a complete outcross but for the 2nd and 3rd litters I used the same sire and both mother and father had the same grandfather so the COI was 15.8% with the average for my breed being around 11.1%.  It is a bit high but not dreadfully so and it was a good litter first time so hope for the same or similar this time.

Its the last litter I shall have from this little girl and if I keep a bitch and decide to have a litter from her, I shall look for a lower figure next time.

> It is a bit high but not dreadfully so and it was a good litter first time so hope for the same or similar this time.<br />

Repeat breedings are generally to be avoided from a population genetics point of view, as they add nothing new.

Also they can often be disappointing when as they rarely provide what you hoped for based on first litter.

I have only done it once when the first litter wasn't large, and I really was struggling fro a mate for my champion bitch (I had imported the sire).  Had I at the time had a choice I would have used another dog, as it was a waste of her breeding potential.  She produced quality in all three of her litters but to only two sires.

What is considered too high? I've seen someone state before their COI is up at around 40%? This is within Staffords.

Generally it is considered that you will see the negative effects of inbreeding once you go above 10% and that it is best to stay under 5%, especially if the COI's are based on fewer than 10 complete generations. Any dogs by imports may only have 4 complete generations recorded by the Kennel Club.

Excellent, thank you for the reply. I had a feeling it was particularly high!

Think of it this way if you mated first cousins the COI would be 6.25% and that is as close as we legally go with human marriage.

Gee, surely any higher than that and you're seriously in risky territory..

My breeds in trouble then????

Many breeds are increased levels of auto immune problems higher risk of inheriting same deleterious gene mutations, lowered immune system, reduced litter size and fertility, higher infant mortality etc.

There is lots of good info and articles on all this, on the Institute of Canine Biology's website.  I don't know that I agree with absolutely every solution put forwards, but the problems are true enough:

http://www.instituteofcaninebiology.org/the-pox-of-popular-sires.html

And a whole load of articles in the blog:  http://www.instituteofcaninebiology.org/blog

What is the CoI of the parents of the dogs you propose to mate?