I have had a long, drawn out, 3 year experience with a friends’ horse agisted on my property, with lymphangitis, until we put him down at 28yo. He was a big, athletic TB, who kept fantastic condition, but the main reason we put him down was nothing to do with the lymphangitis, it was the stringhalt that kept on plaguing him & making his life miserable.
The lymphangitis never even slowed him down - it just looked revolting. After months of fruitless treatment, it just grew to the size that it wanted to grow to, and nothing was going to stop it. After a couple of years we got the vet to drop him and slice the whole thing off, and start again. It was just like really thick slices of hard fat, with no blood vessels running through it. However, all this achieved was to make the horse really sore and really miserable, until it all settled down, started to grow back, and eventually grew back to the size it had been before the vet removed it.
Any treatment we gave it was topical, nothing internal. My farrier and I tried just about every old-fashioned remedy ever heard of. Everything worked wonders for a short while, then reverted to the same old, same old.
I do believe that if we had have been able to keep him in work, it might have improved it dramatically, but at that time we were not in a position to do that.
I imagine that if your mare is to remain purely a brood mare, and the aesthetics are not that important, then once everything settles down, she should be able to cope quite well.
There is loads more I could tell you, and show progressive photos of treatment and results if you want, but I think that would be best dealt with via private email, if you’re interested.
This is the first time I’ve ever had anything to do with posting on this forum, or any forum for that matter, so I haven’t got a clue how they work, or even if this message will reach you. If it does, I presume you will be able to access my email address. If not, then I will keep an eye out for a reply on this forum.
I am in Central Victoria, Australia.
Cheers
Heather