ADCA Online Pedigree Information - PHA etc

[Kathleen]

I am an Australian breeder and have been looking through the ADCA Online Pedigree Information and have a question about the information given regarding PHA and Chondrodysplasia.

The information is given as:
Chondrodysplasia: Non-carrier
PHA: Non-carrier

There is no information given to show if the animal itself has been tested for the genetic mutation/s and found to be a non carrier or if they have the 'non carrier' status because of a antecedent that has been tested and found to be a non carrier.

I find this disconcerting as our DCAI website actually states if an animal has been tested or is 'free by inheritance'.

I am hoping someone who belongs to ADCA can clarify this for me.

Regards
Kathleen

[kansasdexters]

Hello Kathleen,

If you look at the pedigree, you will see a set of letters under the animal's ancestor names that denote PHA status, Chondro status, Horned or Polled status, and Color. The legend to interpret the letter designations is at the bottom of the pedigree page (in the online pedigree). An animal that has a sire and a dam that have noncarrier status for either PHA and/or Chondrodysplasia, is automatically designated as a non-carrier and no test is required for this. If either the sire or the dam is a tested carrier of either PHA or Chondro, then in order to be designated as a non-carrier (or as a carrier), the animal must have a DNA test indicating this. If the sire or the dam have not been tested, then in order to be designated as a non-carrier (or as a carrier), the animal must have a DNA test indicating this.

The problem with this approach is that the ADCA does not require parentage verification for registration. If the registered animal is registered with either the wrong sire or wrong dam, and then automatically given non-carrier status on either PHA or Chondrodysplasia, there is always a potential risk for that animal to actually be a carrier.

Until the ADCA requires parentage verification for registration, there will continue to be a risk that its registered animals are not registered correctly and that there are animals designated as non-carriers (that haven't been tested) and that are actually carriers.

However, many of us are already testing both sire and dam for PHA and Chondrodysplasia, genotyping for parentage, and then registering our animals, even though it is not "required" by the ADCA. You can see which Breeder/Owners are doing this by searching for animals that are sire and dam qualified, and that have both their PHA and Chondro status indicated. We are the Breeder/Owners that provide full documentation (copies of all the tests) whenever we sell our registered breeding stock.


Patti

[Kathleen]

Hello Patti,

Thank you for the answer and explanation.

Re: "The problem with this approach is that the ADCA does not require parentage verification for registration. If the registered animal is registered with either the wrong sire or wrong dam, and then automatically given non-carrier status on either PHA or Chondrodysplasia, there is always a potential risk for that animal to actually be a carrier."

I absolutely agree - and would therefore conclude that anyone wanting to know for certain that an animal is free would have to have the animal tested if they had not already been tested.

Is there any way someone can obtain the information as to an animals actually 'tested' or 'not tested' status?

I mean is that information available from the ADCA?

Regards
Kathleen

[sharethelegacy]

Kathleen,

It is not required of owners to publish their test results in any registry in the US. The Legacy registry is the only DNA genotype registry which requires that every Dexter admitted to the registry must have a DNA genotype and parentage confirmation is automatic for all offspring and
Legacy offers an obligate status report to owners who publish their results and wish to have a report for offspring. Legacy was the first registry to require genotyping and was the catalyst for ADCA to begin requiring DNA tests.

Judy
Legacy