I have only one steer, but I can tell you without a shadow of a doubt that any one of my pigs can put him to shame in creativity, frequency, quantity and duration. During farrowing, it's almost constant and will run you smooth off the property.
My husband and I have made a game of it...
"Which one was that..?!"
"I dunno, I thought that was you that time!"
Brrrddppppp......!
"Now I KNOW that was you THAT time."
"Yeh...." snicker snicker..."that was me."
I would be a lot more worried about swine than cattle on this issue, if I thought that it was really an issue. /forums/images/graemlins/grin.gif