I have never seen a bull with a nose ring. We put rings in the noses of the only two pigs we attempted to raise when I was growing up in hopes of getting them to quit grounding out the fence and running through it. It didn't solve a thing.
Now I'm trying to look for pictures of that bull... 
Pretty sure I haven't seen any bulls with rings in their noses. Was surprised, actually to see how most of the bulls I meet tend to just be laying in their fields or contentedly munching on grass. Don't see anything too scary from the ones I've met so far.
I like to push buttons on thingies that take pictures. Sometimes I like to push other buttons, too.
I only bite on the second Tuesday of every week, usually only mean people - they kinda taste like chicken...
You can call me Wuzzi