Milkweed, how much is too much?

I just acquired some nice 2nd crop grass hay, but some of the bales are loaded with milkweed.

I have had milkweed in some of my hay land over the years, but not enough to be a problem.

Some of these bales have enough milkweed that it is obvious in the bale!

When reading about it, it's enough to scare you to death!

I'm just wondering what your experiences have been!

Thanks much, Dave

Milkweed, how much is too much?