You found the one you were after and that is good. Below is a Wisconsin regional ditty about another large bovine. I believe the actual largest of the cows is the giant Holstein sculpture up on a hill near interstate 94 in western North Dakota.

THE BIGGEST COW
Words by Peter Berryman (1988); tune traditional (Bill Grogan's Goat)

The biggest cow - I ever seen
Was over by - Prairie du Chien.

Go take a peek - But if you do
When she says, "Moo" - You better moo.

That ain't quite right - She don't say moo
Since she's been here - It's something new

Since she been up - Wisconsin way
She don't say Moo - She says Moo Hey

I grabbed her horns - Climbed on her back
And rode her to - Prairie du Sac

Which din't take long - Cause when we's through
She's only took - One step or two.

With her head in - Prairie du Chien
She gives her milk - Down by Racine

So there the farms - Are full of joy
But there is fear - In Illinois

rich r