I don't find more breeders standing parents with these genetic defaults. If anything I find the public becoming more aware of them, and wanting 5 panel clear horses.
Some older stock that have babies on the ground, and are now just getting tested is where I see the problem.
I know a breeder that tested her 19 year old 3 time world champion. No reason to assume she had PSSM1, she had old bloodlines. Nothing known in them, no symptoms.. but she turned up n/PSSM1, and so did two of her previous foals.
It will take many generations to get rid of the defects, but the more buyers become educated, the more the demand for 5 panel clear horses rise, the more breeders will only breed 5 panel clear horses. At least that's my hope, it's all about supply and demand.
No reason to punish the horses currently on the ground though, by not allowing them to show.
Unfortunately, many people don't understand genetics, thus go on a ;witch hunt'
Read the info I posted. ALL breeds have recessive genetic defects, with that carrier being normal. All any breeder has to do, is have his mare or stallion tested, and then make sure to also have the test results from the other part of that breeding, and then avoid breeding two carriers together
All dominant genetic defect positive horses should not be allowed to breed.
Recessive genetic defects only become apparent, when horses with similar ancestors are bred together, thus two carrier mated. Genetic testing avoids that possibility, yet still allows those good genetics, as in cutting bred lines, that carry HERDA, going back to Poco Tivio, often with generations in between, not showing any problem, because two carrier were never mated
There is absolutely no problem, breeding a horse that carries HERDA or GEBD, to a horse that tests negative for either. No affected foal possible
The recessive genetic defects in AQHA horses have become well known, for the simple fact of the sheer number of AQHA horses.
Combined Immuno deficiency and lavender foal syndrome have been present in Arabians for many years, yet, far as I know, this un-scientifc type of culling has never been suggested in that breed.
How about Paints that carry LWO or deafness?
Genes constantly mutate , and new recessive genetic defects wil continue to occur. Cull all those horses, and soon you will have a breed with very few lines of horses.
AGAIN, A BREED SHOULD STRIVE TO BE FREE OF GENETIC DISEASE, BUT NOT TRY TO ELIMINATE ALL CARRIERS , THAT ARE NEVER AFFECTED, AND, WHO WILL NEVER PRODUCE A CLINICAL DEFECTIVE BABY, AS LONG AS THAT HORSE IS NOT BRED TO ANOTHER CARRIER
.it is unfortunate that many people don`t understand the difference between a dominate genetic defect, like hypp, and recessive genetic defects like HERDA, far as mode of inheritance and expression