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NALC Registered Breeder Since 1996

Specializing In Natural Bobtails and Natural Rearing

PROVEN HUNTING AND WORKING COMPANIONS FOR 20 YEARS
AND 7 GENERATIONS

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Bobtail DNA Study
**Update - Results Jan, 9, 2009**



The BCA has taken part in a Bobtail DNA Study being done in France sponsored by:

* Université Rennes 1 - Canine Genetics Research Projects
*
Canine Genetics Research Projects
* Antagene Reseach and Analysis Laboratories


The same dominant bobtail gene has been identified in many breeds that carry this trait.
23 breeds (360 dogs, including 156 natural short tailed) in which natural bobtailed
dogs exist, have been DNA tested for the C189G gene.
 17 of these breeds carry this gene resulting in the short-tail phenotype.
6 of the breeds involved in the study did not carry the gene or any known substitution
or other mutations in the T gene coding regions.
See below for a list of the breeds in the original study.


In Dec of 2008 the BCA submitted 10 DNA samples to the study -
5 samples from bobtail dogs & 5 samples from longtail dogs.

We carefully selected a group of dogs to take part in the study to give
a comprehensive overview of the gene within the breed.
Including up to 3 generations, offspring and siblings with different phenotypes.


The results of the study are as follows -

The Catahoula breed carries the same dominant bobtail gene - C189G -
as 17 other breeds in the study.


The genotype of all 5 longtail dogs are DNA proven to not be carrying C189G

The genotype of all 5 bobtail dogs are DNA proven to be heterozygous for the bobtail gene C189G -
each dog carries 1 longtail and 1 bobtail gene
 

**Confirmation Of The Dominant Bobtail Gene**

3 of the longtail dogs in the study are DNA proven longtail homozygous and produced
DNA proven bobtail offspring when bred with a bobtail mate.
 This verifies that the bobtail gene is dominant -
only one parent need be carrying the gene in order to produce bobtail offspring.
 

**Also included in the study**

3 longtail dogs from a bobtail parent (1 of these dogs having 2 bobtail parents)
 are DNA proven to be longtail homozygous.

**NOTE** - The phenotype of the bobtail is of a variable expression and the length can
range anywhere from a very short stub to a 3/4 length tail.

**NOTE** - There have been reports of bobtail offspring resulting from 2 longtail parents.
In some cases it has turned out that one of the parents was actually a 3/4 length or more
bobtail, and not a full longtail .
It is also possible that another bobtail gene is responsible, as there are other bobtail gene/s
involved in other breeds.
Or that C189G has an incomplete penetrance. DNA testing would confirm if this was the case.
I have no dogs that I could DNA test as in 17 years I have no knowledge of a longtail dog
from my lines producing bobtail offspring.



Below is a listing of the dogs tested and their relationships.
The two longtail dogs from longtail parents
and the bobtail dog from two bobtail parents are unrelated.



** Longtail Dogs **

Dog’s Name

Phenotype Of Parents

Sample #

DNA Test Results

Cats Cradle’s Annie

2 longtail parents

174381

Homozygous Longtail

Diamond E's Swamperella

2 longtail parents

174390

Homozygous Longtail

Reel Zydeco’s BT 

1 longtail & 1 bobtail parent

174388

Homozygous Longtail

Countryanna’s Cane Cutter

1 longtail & 1 bobtail parent

174386

Homozygous Longtail

Reel Zydeco’s Chula

 2 bobtail parents

174389

Homozygous Longtail


** Bobtail Dogs **

Dog’s Name

Phenotype Of Parents

Sample #

DNA Test Results

Cats Cradle’s Cayenne

1 longtail & 1 bobtail parent

174385

Heterozygous Bobtail

Uchi Aka Inu’s Raidon

1 longtail & 1 bobtail parent

174383

Heterozygous Bobtail

Reel Zydeco’s Thumby

1 longtail & 1 bobtail parent

174387

Heterozygous Bobtail

South Slough’s Dammit-All “Toad”

2 bobtail parents

174382

Heterozygous Bobtail

Reel Zydeco’s Memphis Mack 

2 bobtail parents

174384

Heterozygous Bobtail



** Note - All samples were obtained and verified by a licensed veterinarian as is required by the study. **


** Relations **

Sample # 174381 – Longtail
Parents – 2 longtails

Sample # 174390 - Longtail
Parents – 2 longtails

Sample # 174382 – Bobtail
Parents – 2 bobtails

Sample # 174385 – Bobtail
Parents – 1 longtail (sample #174381) and 1 bobtail

Sample # 174386 – Longtail
Parents – 1 longtail (sample # 174390) and 1 bobtail (sample # 174382)

Sample # 174388 – Longtail
Parents – 1 longtail (sample # 174386) and 1 bobtail (sample # 174385)
Grandparents – 1 longtail (sample # 174381)
              1 longtail (sample # 174390)
              1 bobtail (sample # 174382)

Sample # 174387 – Bobtail (Sibling of sample # 174388)
Parents – 1 longtail (sample # 174386) and 1 bobtail (sample # 174385)
Grandparents – 1 longtail (sample # 174381)
              1 longtail (sample # 174390)
              1 bobtail (sample # 174382)

Sample # 174383 – Bobtail
Parents – 1 longtail and 1 bobtail
Grandparents – 1 longtail (sample # 174381)
              1 bobtail (sample # 174382)

Sample # 174384 – Bobtail
Parents - 2 bobtails (sample # 174385 & sample # 174383)
Grandparent – 1 longtail (sample # 174381)
Great-grandparent – 1 bobtail (sample # 174382)

Sample # 174389 – Longtail (Sibling of sample # 174384)
Parents – 2 bobtails (sample # 174385 & sample # 174383
Grandparent – 1 longtail (sample # 174381)
Great-grandparent – 1 bobtail (sample # 174382)



Antagene Reseach and Analysis Laboratories” will now be offering DNA testing
of the bobtail gene for the Catahoula breed.

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This is a listing of the 23 breeds included in the original study.

17 breeds with naturally short tails that carry the C189G bobtail gene -
which we can now add the Catahoula breed to.

Australian Shepherd
Austrian Pinscher
Australian Stumpy Tail Cattle Dog
Bourbonnais Pointer
Brazilian Terrier
Brittany Spaniel
Croatian Sheepdog
Danish/Swedish Farmdog
Jack Russel Terrier
Karelian Bear Dog
Mudi
Polish Lowland Sheepdog
Pyrenean Shepherd
Savoy Sheepdog
Schipperke
Spanish Waterdog
Swedish Vallhund

The Welsh Corgi Pembroke and Boxer also carry the same gene.
The gene being transferred from the Corgi to the Boxer
which set in motion the gene study.


6 breeds with naturally short tails that do NOT carry the C189G bobtail gene.

Boston Terrier
English Bulldog
King Charles Spaniel
Miniature Schnauzer
Parson Russel Terrier
Rottweiler

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