While feeding a mother and her newborn litter of piglets this morning, I noticed that most of the piglets seemed to have persistent muscle spasms, specifically on their backends. They were pretty much vibrating to different degrees. I did not have time to watch for an extended period of time, but I was there long enough that is definitely seemed like some serious condition and not them just acting weird while stretching their legs.
Any advice for what this might be, and cures?