This is a lightly edited version of my original 2005 BBR post. It's copyright Lisa Corell Auerbach, 2005 and has been used in some of my other copyrighted materials - used here with permission. Main change is I added a comment and redacted some people and kennel names as I haven't had a chance to ask if it's ok to use them here, and I don't like to surprise people. If you're on the BBR list, the unredacted post is in the archives circa 2005.
"A while back, I did a pedigree analysis of sample domestic Basenjis, with an eye to including samples from "relatively unrelated" lines. I was interested in finding out why "full" COI's are so high for this breed. For example, the COI on my Pete - who had no ancestors doubled in the first 3 generations - was over .3, which is greater than breeding a sire to his daughter. I found extremely high COI's on a signficant percentage of Basenjis I looked at, which piqued my interest in looking at Basenji pedigree structure.
The dogs I reviewed included successful sires and Honor Roll Stud Dogs (including Ch. JuJu's Pistol Pete, Ch. Kazor's Deerstalker, Ch. Akuaba's Tornado, Ch. Reveille Boutonniere, Ch. Berimo's Roustabout, etc.), Datar, and dogs from two domestic lines frequently identified as having been kept fairly distinct for a long time.
About half were dogs I'd used or that had a connection to my dogs, the rest were dogs I thought would be relatively unrelated.
The results of this sample were as follows:
1. There were basically eight significant founders - Bongo, Zig, Bereke, Kindu, Kasenyi, and to a lesser degree, Fula, Bokoto, and Wau.
Percentages of Bongo ranged from 24.11% to 16.136%.
Percentages of Zig ranged from 21.793% to 15.36%.
Percentages of Bereke ranged from 18.654% to 12.504%
Percentages of Kindu ranged from 13.88% to 5.943%
Percentages of Kasenyi ranged from 13.863% to 5.827%
Percentages of Fula ranged from 15.234% to 0.322%
Percentages of Bokoto ranged from 7.681% to 5.156%
Percentages of Wau ranged from 9.195% to 2.393%
No other foundation dog contributed as much as 2% to any dog I analyzed.
Of the foundation dogs with less than two percent contribution, three founders, Bungwa (1.328%-1.922%), Bakuma (0.43%-1.93%), and Bashele (0.681%-0.909%),
contributed between 0.43% to 1.93% of ancestry. Kiki of Cryon contributed 0% to 4 dogs reviewed, and 0.020% to 0.415% to the rest. Mbinza contributed 0% to five
dogs reviewed, and 0.096% to 0.232% to the rest.
No other foundation ancestor was identified that contributed as much as one tenth of one percent by ancestry to any of the dogs reviewed.
Conclusion - the US Basenji gene pool has approximately eight significant foundation
Virtually all of Kindu and Kasenyi's descent comes through a single individual, Kingolo - percent descent ranging from 10.825% to 25.199%. Whether to argue that there are 7 founders (and use Kingolo instead of Kindu and Kasenyi), I leave up to you.
2. Domestic Basenjis also have significant bottlenecks other than original ancestors. The first appears to have occurred in which "of the Congo" (OTC) dogs bred on the most. Some samples -
Percentages of Kinga of the Congo ranged from 29.063% to 43.635%
Percentages of Piccolo of the Congo ranged from 12.481% to 15.613%
Percentages of Orange Fizz of the Congo ranged from 13.673% to 20.303%
Percentages of Brown Trout of the Congo ranged from 15.515% to 23.002%
And so on. I did eleven OTC dogs, that ranged from about 6% to over 43% of total ancestry of modern dogs.
Conclusion - Basenjis in the US show a second significant genetic bottleneck through important OTC dogs. [Additional comment – this appears to be related to the WWII bottleneck – see VTW’s “Coincidences” article reprinted in The Basenji recently.]
3. American dogs have a third significant bottleneck in the 1960's and 1970's. For American dogs, which excludes Datar, with the exception of the two kennels picked specifically because they had avoided popular sires of that era, percentages were as follows:
Percentages of Ch. Reveille Recruit ranged from 13.28% to 27.539%
Percentages of Ch. Reveille Re-Up ranged from 12.988% to 22.656%
Percentages of Ch. Khajah's Gay Flambeau of Ed-Jo ranged from 11.67% to 26.172%
Conclusion - Basenjis in the US had a third significant genetic bottleneck in the 1960's and 1970's.