What does it mean to add genes?

[Nemo]

Jo,

Thanks for taking the time to provide so much thought provoking detailed information. I almost missed a meeting because I was so engaged reading all of it, lol. I know I have several questions but I'll have to wait until after work to ask them.

Clay

[JoT]

@Nemo:

Jo,

Thanks for taking the time to provide so much thought provoking detailed information. I almost missed a meeting because I was so engaged reading all of it, lol. I know I have several questions but I'll have to wait until after work to ask them.

Clay

Thanks Clay! Just in case your computer presented my two posts on different pages … I posted two long comments this morning. The first with an attached figure appeared on page 6 of this thread and my second this morning appeared on page 7.

[Patty]

I know the situation is different in the UK but I find this thread extremely interesting and of course much applies to our UK population.

I am having to print your posts - for my own information - Jo because I find it difficult to read off a computer - I hope I have your permission?

[JoT]

@Patty:

I am having to print your posts - for my own information - Jo because I find it difficult to read off a computer - I hope I have your permission?

Yes. Of course.

[sharronhurlbut]

Thank you for this Jo. I will be rereading it until I am sure I "get" it all.

[Itzyu]

I think it might be useful to post some information about preserving land race breeds. My primary source when researching this over the years has been Dr Phil Sponenberg, a geneticist and professor at Virginia Tech’s vet school, who is a specialist on preserving rare and land race breeds.

I’ve also gotten useful insights from Species Survival Plans, but IMHO Sponenberg is both more applicable and presents more practical applications. FYI, Dr Sponenberg is scheduled to speak at the 2012 National, which should give Basenj fanciers a useful opportunity.

Sponenberg has advised many breeders, in many species, on how to preserve their breeds. One frequently asked question is what to include in the registered breeding pool. His principle is simple. Include as many animals as possible of that breed, and do not include those that are not of that breed. He has a fairly detailed discussion of this, with examples, in his last book, Managing Breeds for a Secure Future, which is available from Amazon and from the ALBC. See particularly pages 20-23.

As far as gene loss goes, Boyko’s work on genetic diversity in Basenjis versus village dogs shows very significant reduction in genetic diversity using microsatellite markers, with about .356 for Basenjis versus .553 to .684 for various populations of village dogs.

Bringing in new individuals from the same geographic areas does add new alleles (versions of genes – all dogs have the same genes - just different versions of them) and does contribute to genetic diversity. In many land race breed populations, all of the individuals may come from a relatively narrow area (Soay sheep, Shetland sheep, Fjord horses, and Icelandic horses all spring to mind) but there can be significant genetic diversity within the parent population in any given location, that requires a fairly large number to sample thoroughly.

In general, a minimum of 100 founders is given, and I have heard 200 bandied about as a more desirable minimum number. In practical discussions of preserving land race breeds, I have never seen an expectation that founders be unrelated – all members of a land race breed, or any breed, are expected to be related – but rather terminology used that founders are the individuals where known pedigrees stop.

Increasing diversity in the gene pool was a major driver in the 1980’s importations, per people who went. Dr Russ Brown, a geneticist from Virgina Commonwealth University, contributed to the petition to open the stud book, contributing from that perspective. Russ lived near where I worked, and was the breeder of my Ch JuJu’s Pistol Pete. I understand that some people do not realize these dogs were imported to expand the gene pool, but Russ was quite definite about it.

[Itzyu]

Avongaras have made a significant impact on the gene pool, and not in the sense of one cross and quickly breeding away from. A number of long time breeders breed straight Avongaras. I was able to come up with a dozen serious breeders that have recently bred full Af litters, plus probably half again that many people working with them (ie, own one or two Avongaras that they keep intact, and work with the group.) Plus the overseas people.

Of the dozen I thought of right off, they’re pretty much all working together to a greater or lesser degree. The goal is to maintain an outcross gene pool, of good type and quality, which does offer significant value to the breed.

Newly imported Avongara stock would be particularly useful in maintaining a viable outcross group for the longer term, and some of the newer Avongara imports have already been incorporated. Others (like the ones in the nice pix Katie and Ethel had) show a lot of promise.

Most of the breeders I know using Avongara blends are not using one outcross and then diluting – they are using significant percentages of Avongara stock. Good examples from my region include the #3 producing brood bitch of all time, Ch Eldorado’s Ooh La La (38.625% Avongara from 3 separate crosses that incorporate 5 different Avongara founders.)

Or you can look at a stud dog I have used, Ch Wakan MicCookie http://www.wakanbasenjis.org/Micki%20collage%20jpg.jpg 31.25% Avongara and his littermate Ch Wakan Sugar Cookie http://www.wakanbasenjis.org/SugarCollage.jpg

My own favorite brood bitch, Itzyu Good Golly Miss Molly (call name Sally, long story), is 50% Af – the result of breeding two good half Afs together – dam of some very nice pups, with one ready to go out and on my FB page, and two on deck. The latter two are about 35% Af, from breeding to a dog that is 19.3125% African, with pups that are about 35% Af. The pups go back in 5 different lines, with each line going to one or more of five different Avongaras (Gangura, Diagba, Zamee, Mbliki, and Ngola.) It’s not cross once and out – it’s blend, and blend back, and blend back again.

I have full Afs in my kennel that also go back to Kposi and Elly, plus breeding rights on a Tambura kid (or possibly kids, another long story) and Renzi is also represented in my part Afs and in a number of dogs in this area.

These dogs have pedigrees that have been, and are being, used by many different breeders. Of the 87/88 imports, most of what got lost, was lost the first generation (Wele died in an accident, Renzi went sterile after one litter although his kids were used and are in a good number of Virginia pedigrees, Nabodio was in a pet home and did not produce pups when he was used as an older dog, one was not bred by choice, and one had pups with bite issues and was not bred down from.)

Diagba, Gangura, Zamee, Mbliki, Ngola, Elly, and to a lesser extent Kposi are pretty well represented in the gene pool – even Kposi, which is the rarest of the bunch, has full Af descendents with some linebreeding to her going on. I have dogs here that are 25% or more Gangura, Zamee, or Elly – just lost a Kposi grandson who has multiple kids in the gene pool - and there are many dogs out there that are 25% or more Mbliki or Diagba.

[Nemo]

@Itzyu:

Sponenberg has advised many breeders, in many species, on how to preserve their breeds. One frequently asked question is what to include in the registered breeding pool. His principle is simple. Include as many animals as possible of that breed, and do not include those that are not of that breed. He has a fairly detailed discussion of this, with examples, in his last book, Managing Breeds for a Secure Future, which is available from Amazon and from the ALBC. See particularly pages 20-23.

Itzyu, I'm glad you joined the discussion. Without having easy access to the book to read about the bolded sentence, can you paraphrase what comments he has on how "animals of that breed" and "animals not of that breed" can be defined? I think that gets to the crux of some of the issues discussed here.

[Nemo]

@Itzyu:

Avongaras have made a significant impact on the gene pool, and not in the sense of one cross and quickly breeding away from. A number of long time breeders breed straight Avongaras.

Diagba, Gangura, Zamee, Mbliki, Ngola, Elly, and to a lesser extent Kposi are pretty well represented in the gene pool ? even Kposi, which is the rarest of the bunch, has full Af descendents with some linebreeding to her going on.

Can you help me understand your definitions of the above? I think that would be a useful context to further the discussion. What is a "significant impact" or what is "well represented"? This would help me understand the different perspectives on this.

[Itzyu]

@Nemo:

Itzyu, I'm glad you joined the discussion. Without having easy access to the book to read about the bolded sentence, can you paraphrase what comments he has on how "animals of that breed" and "animals not of that breed" can be defined? I think that gets to the crux of some of the issues discussed here.

It's really good to get the book - well worth buying and I strongly recommend it for anyone interested in Basenjis or any other land race breed of any species. See www.amazon.com or the ALBC website.

That said, ALBC has their books online at Google Books and you can read pages 20-23 at http://books.google.com/books?id=GmsDwDuuP2cC&pg=PT100&lpg=PT100&dq=sponenberg+preserving+breeds&source=bl&ots=6RiX-84Svh&sig=LZhXlf8_auMwBfmuShgk9nDfVTY&hl=en&ei=EWtMTti5Ls25tgelib28Cg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBYQ6AEwAA#v=onepage&q&f=false

Sponenberg says it better than I can, and the whole section - heck, the whole book - is worth reading.

[Nemo]

@Itzyu:

It's really good to get the book - well worth buying and I strongly recommend it for anyone interested in Basenjis or any other land race breed of any species. See www.amazon.com or the ALBC website.

That said, ALBC has their books online at Google Books and you can read pages 20-23 at http://books.google.com/books?id=GmsDwDuuP2cC&pg=PT100&lpg=PT100&dq=sponenberg+preserving+breeds&source=bl&ots=6RiX-84Svh&sig=LZhXlf8_auMwBfmuShgk9nDfVTY&hl=en&ei=EWtMTti5Ls25tgelib28Cg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBYQ6AEwAA#v=onepage&q&f=false

Sponenberg says it better than I can, and the whole section - heck, the whole book - is worth reading.

Thanks, I can't preview those pages but I will definitely add it to my wish list.

[Itzyu]

@Nemo:

Can you help me understand your definitions of the above? I think that would be a useful context to further the discussion. What is a "significant impact" or what is "well represented"? This would help me understand the different perspectives on this.

I think that is going to differ depending on who you talk with - but to me, a significant impact is when dogs are recognized as being useful in the gene pool to enough people that they are likely to have a lasting influence.

Well represented, to me, means descendents are in multiple households, appear likely to breed on, and are not limited to one or two people or one or two small programs.

They tend to go together, for obvious reasons, but aren't exactly the same thing.

[Itzyu]

@Nemo:

Thanks, I can't preview those pages but I will definitely add it to my wish list.

Try using the right hand scroll bar - it should let you scroll all the way up. At least when I browsed it, I was able to read that section.

[Nemo]

@Itzyu:

Try using the right hand scroll bar - it should let you scroll all the way up. At least when I browsed it, I was able to read that section.

It's just letting me preview a different section of the book, pages earlier in the book than 50 are "omitted from this book preview." Just bad luck with Google Books. The section I looked is very interesting though. Definitely looks like a good book.

[Nemo]

@JoT:

[
This is a critical statement. The value of adding additional native dogs to access other EFb genes only comes from adding dogs within the EF biome from areas not already represented by current founders. To continue bringing in dogs from the same geographic area(s) within the EF biome does not add "new" genes or contribute to gene diversity.

Jo, my main question goes to this general statement. Practically, do these "areas not already represented by current founders" still exist and if so, are they accessible and relatively "un-compromised" (for lack of a better word) by dogs that may represent other areas in the EF biomes or elsewhere.](http://www.suite101.com/content/central-africas-dog--congo-origin-of-the-basenji-a224967)

[Nemo]

@Itzyu:

I think that is going to differ depending on who you talk with - but to me, a significant impact is when dogs are recognized as being useful in the gene pool to enough people that they are likely to have a lasting influence.

Well represented, to me, means descendents are in multiple households, appear likely to breed on, and are not limited to one or two people or one or two small programs.

They tend to go together, for obvious reasons, but aren't exactly the same thing.

Thanks, I realize this all depends on perspective. It would be beneficial IMO if "significant impact to the breed" could be dimensioned in a more quantitative way. We seem to have ways to demonstrate "significant negative impacts" such as with the discussions of popular sires and their disproportionate contributions to the gene pool but "positive impacts" seems to be more nebulous to demonstrate.

[Itzyu]

@Nemo:

It's just letting me preview a different section of the book, pages earlier in the book than 50 are "omitted from this book preview." Just bad luck with Google Books. The section I looked is very interesting though. Definitely looks like a good book.

A brief summary of the relevant section - and please get a copy of the book if you can - what to include and what to exclude is the stickiest issue, and more difficult with land race breeds than any other. In general, one should look at phenotype and cultural setting. It can be misleading with individuals, but is indicative with populations.

History can be greatly of use. Phenotype is important. DNA can be useful (parenthetically, Boyko's DNA work showed that most African village dogs he sampled were either relatively pure or highly admixed, with villages having entirely or almost entirely one or the other.)

He has page after page of examples of applying this (it is also a frequent topic in his other writings.)

[Itzyu]

@Nemo:

Jo, my main question goes to this general statement. Practically, do these "areas not already represented by current founders" still exist and if so, are they accessible and relatively "un-compromised" (for lack of a better word) by dogs that may represent other areas in the EF biomes or elsewhere.

The South Sudan is newly accessible (although I don't know of any Basenji person who has gone yet) and is historically a major home of Basenjis. I have heard multiple people interested in going there - I do not know if a trip is planned yet but I would be surprised if it did not happen.

However, in bringing in new dogs, you do NOT want to avoid areas already represented by current founders. Unless you've already gotten 100-200 founders well represented in the gene pool, the area is likely to include very significant untapped genetic diversity. Additional genetic diversity is likely even if we had that many founders. We still have, last I checked, less than 50. And that genetic diversity is highly correlated with healthy long-term survival of a breed.

The principle used to preserve rare and land race breeds is basically "include as much genetic material that is of that breed as you can".

[Itzyu]

@Nemo:

Thanks, I realize this all depends on perspective. It would be beneficial IMO if "significant impact to the breed" could be dimensioned in a more quantitative way. We seem to have ways to demonstrate "significant negative impacts" such as with the discussions of popular sires and their disproportionate contributions to the gene pool but "positive impacts" seems to be more nebulous to demonstrate.

Significant impact isn't a quantitative measure. It's a qualititative one. It varies depending on your values, your breeding program, and what you are selecting for. Major questions are usually, which population, and what qualities do you consider significant.

Giving horse examples (because they are likelier to keep me out of trouble) - Nazeer has a significant impact on the Arabian class A halter population, as does El Shaklan, Bey El Bey, and Padron.

They have no significant influence on the CMK population (very popular as endurance, family, riding, and dressage horses.) You'll occasionally see a distant descendent of Nazeer via Ralvon Elijah, who is 90-odd percent Crabbet otherwise, but that's about it. On the other hand, Aurab, who you don't see a lot of in pedigrees in the Class A halter ring, is a major influence on Arabian dressage horses and a significant force in CMK pedigrees.

For Basenjis (treading carefully here), the new imports are being widely used, in significant percentages of pedigree (not once and out) in show dogs in my area and in other areas that I know. This includes dogs that are top Honor Roll producers (see previously mentioned #3 Brood Bitch of all time, dam of at least one BIS winner and a boatload of champions, who is about 40% Avongara), National Specialty Award of Merit winners, all-breed Best in show winners, and top performance competitors. The Honor Roll producers include at least a couple of Avongaras, dogs that I frequently see in pedigrees.

So I'm not sure I "get" the idea that the earlier imports have not been well-used. In general, I see better, not worse, overall conformation with full and part Afs - I may be seeing results of more successful selection, but the source dogs are the same. In particular, Afs and Af blends I see tend to have better substance. They avoid extremely upright and forward shoulders too common in domestics. All I have seen have better musculature than average.

The usage I am seeing is not "one and out" breeding as much as careful and ongoing blending over multiple generations.

The Avongaras are significant to these programs, and these breeders feel they are getting better dogs through them. They are winning enough, and having enough other people to use their dogs, that their impact on the overall breed is substantial.

[Nemo]

@Itzyu:

The usage I am seeing is not "one and out" breeding as much as careful and ongoing blending over multiple generations.

The Avongaras are significant to these programs, and these breeders feel they are getting better dogs through them. They are winning enough, and having enough other people to use their dogs, that their impact on the overall breed is substantial.

You're talking about native stock that people wanted to use and my perception is that you won't get much argument there. If people are using them regularly then they have significant value and could have impact to the breed as a whole. Going back to the original question at the beginning of the thread (and granted it started as a continuation of another thread), I believe the context of "one and out" comments were directed more to potential introduction of native stock of "lower quality" which do not have as much general appeal to breeders. If they have so many faults that you would have to do a "one and out" to compensate to get their "new genes" then what's the point? I think it all gets back to what individual breeders consider a "basenji" to be, it appears there is a wide range of perspective particularly when talking about native stock.