Wisconsin cows are just not used to cold winter weather (sarc)
the fact that they herd together to share their body warmth should clue us in that freezin’ is an unlikely reason
Well, unless you are the cow on the outside ring of the herd.
Seriously though, if the cows did have some disease (virus), then a cold snap could kill them all at once.
They could have survived the cold, or the virus, but not both.
How do the cows decide which cows have to be on the outside of herd? Or do they take turns? :-)
It hasn’t been cold in Wisconsin yet this year.