Ok , my take on the general situation is...
To quote myself from another thread, if we are going to breed, IMO our job, like nature's, is to select the best, have only the best reproduce and eliminate animals with defects. Those not worthy of being bred should be neutered so they cannot reproduce.
A breeder must learn to evaluate a horse honestly and the pluses and minuses must be weighed and considered. It is up to the individual to decide which faults are tolerable, and which defects are unacceptable.
There is a difference between faults and defects. Faults are aesthetic conformational flaws. Generally these are aberrations that do not meet a particular breed standard, which is the guideline written by and for breeders as a goal for the improvement of the breed.
Faults can be split into 3 catagories;
1. Cosmetic. These are non-structural faults which are inherited. Colour pattern, pigmentation and eye colour are examples.
2. Structural. These faults don't conform to the breed standard and would cause failure in the show ring.
3. Environmental. These faults are acquired. They include scars and injuries.
Faults are not necessarily desirable or proper. But they are manageable. You can select and manage these faults and still breed from these animals.
A defect, on the other hand, is a genetic malformation or disease which severely affects the horses health, soundness, structure and/or temperament.
Defective animals have genetic malformations and diseases. It makes no sense to attempt to breed from a defective animal. You can't breed a horse with a fault and expect to improve the breed. Horses with a defect can make wonderful riding companions but should not be bred.
Breeding animals with defects has a high probability of failure and the discards and defects get dumped into the horse market, causing heartbreak and expense for the owners.
The problem is compounded when they are sold on and an unsuspecting new owner of one of these discards decides it is time to "have a foal". The horse with genetic defects finds its way back into the breeding program.
A defect can be masked in a healthy line. A previously healthy line can be contaminated if you breed animals with defects into the line. You can never get the defect out. The whole line is dead. IMO animals who have defects should not be bred.
If you are going to breed horses with faults, breeding to horses with opposite faults will not cancel out the fault. Genes don't work that way. You can't mix them. For example, if your mare has an undershot jaw, don't seek out a stud with an overshot jaw. The two faults will not cancel each other out. You will instead end up with a liner full of undershot and overshot jaws, with a few perfect ones thrown in for good measure.
Defects should not be messed with. far better to work with horses who are sound, healthy, and stable. You can breed a defective horse to a sound horse and the foals may appear sound, but don't be fooled. The genetic defect has not been bred out. It is still there, even though you can't see it. What has been created is a walking time bomb.
Basicaly, I think it is best to breed to individuals who are most nearly perfect and whose ancestors were sound in the area you are trying to correct. If the foal who results from your breeding is not helping improve the breed, you have a responsibility to find a new bloodline. Start fresh, with a better bloodline.
JMO and no offense meant to the OP.
