Yep, I just thought I would clear up that information. I have dealt with a lot of horses with lordosis. Genetic lordosis is not something that develops over time, whereas there are some sway back cases that are(age related mostly). If they have it, it can get worse, especially as the horse grows, but you KNOW a horse has it before they are weaned. Genetic lordosis is kind of funny. A horse can have the specific gene marker to be lordotic, and not show it, and never have a foal they produce show it. On the same note, a horse that shows it can throw all straight backed foals. Researchers have just recently found the genetic marker for it, and are currently researching causes. I personally believe nutritional and environmental factors play a big role. I have had them out to the farm, and have spoken to them numerous times. They really love their work. Since it is so funny on when it pops up, and saddlebred people too are really funny when it pops up, it is really difficult to study. Saddlebred people don't breed for it, and don't really want to be associated with the production of it, so they are well hidden, not talked about, and not promoted until they are showing.
This colt honestly looks like he will be fine. Weak back for sure, but I wouldn't even consider it "soft"(granted, terminology is highly debated even in the saddlebred world. One man's "soft" is another man's "low".) He is likely not going to be put through any rigorous training that would severely damage his back at this point in its weakened, under-muscled state, at least until he is in a better condition. At the worst, he might be a little difficult to fit a saddle to.
Not sure I agree with this (red marked)
A long time ago on one of these forums, a lady was showing her mare with extreme lordosis. She showed pics from the time the foal was born and through her successful halter show career. No sign of it. The mare had excellent care and no hard work. She was not an aged mare, but had major lordosis. So it can come on later and not be seen when young. This was also a Saddlebred. I cannot remember her breeding.
In Gypsy Horses, I have only seen it once. Even looking at huge herds of Gypsies in the UK, I have never seen it. However, in this one horse - again a mare, as an adult it became incredibly pronounced. She was imported to the US as a nicely conformed youngster. She had plenty of very close relatives here. I was shocked when I saw her. She had never been worked hard and received proper care. As far as I know she has never been bred, which is probably a good thing.
I know Lordosis has been noted in many breeds, but I have only really been interested in it, in Gypsies and Saddlebreds, since they are my favourite breeds.
I do think that such horses should not be bred. I do think that in many cases, it is covered up, just as many other problems in animals. Certainly aged mares, having produced many offspring, will have weak backs, but true Lordosis is something quite different.