New Fashion in Nose Rings?

What looks like a punk accessory for fashionable cattle actually has a less glamorous purpose. The young cattle when they are penned together start to try to suckle on each other. If the suckling is enough it can cause lactation in the heifers, which ruins their udders for milking. Hence the accessory which discourages the behaviour.
And if you think the nose ring looks uncomfortable you could consider the other, more traditional, method of discouraging suckling in young cattle.

This photo probably isn't clear enough to show that this heifer's tongue has been cut into a point so that it can't physically latch onto a teat.