A cow with bad mastitis! How Do I find it?

There's a cow in one of the herds that has mastitis really bad and we need to identify and treat it ASAP!
Hi I'm Andrew, a 4th generation kiwi dairy farmer.
I work alongside my father on our family farm in one of New Zealand's dairy heartlands.
Follow me as I show you the day to day running of our farm and how our farming operation is much different than other parts of the world.