Actually the headline is a little misleading; it’s actually the farmer that does the tai chi and not the cows themselves.
Rob Tavener says that practising tai chi in front of his cows relaxes them and increases milk production. Apparently if he is relaxed and happy, then so are his cows. He says “Animals are very receptive to human moods and tai chi is all about leaving your problems behind and getting into a better zone,” he said. “The happier I am, the happier the cows are. And the happier they are, the more milk they produce.” I’m not convinced.