It wasn’t really, I guess I just didn’t make my thought process clear.
I’m not talking about the nutritional content of silage/haylage, I’m talking about the differences in what cattle can eat vs horses from a health perspective.
Haylage for horses is really not done much in the US. My “not the healthiest” comment was about the stuff that’s questionable for horses, and therefore, is by default also not the healthiest for cattle. That’s not the same as saying “haylage isn’t healthy for cattle”
Some people absolutely to try to feed haylage/silage to their horses, and get it from people who SAY it’s for horses, but it’s really questionable quality to start with, from a safety perspective, no matter who you’re feeding it to.
US - doesn’t do haylage much for horses, and those who do are often - IME - not doing it well enough
Europe - a lot more horse-quality haylage is produced.