Healthy, happy cows may produce higher-quality milk, according to researchers studying the vitamin and mineral profile of milk from dairies across Western Australia. While the milk from all six WA dairies tested showed high levels of B12, B2, calcium, and lactoferrin, a dairy part-owned by billionaire Gina Rinehart stood out for its particularly high vitamin and calcium content. “It’s interesting because we’ve been producing consumer milk for more than 18 years now and in that time a lot of people have said, ‘what do you do differently?’, and so we’ve been aware that our milk is different, but not really sure why,” Bannister Downs managing director Sue Daubney said. The next phase will aim to determine the exact drivers behind the higher-quality product by testing it against other variables.Bannister Downs is jointly owned by the Daubney family and Mrs Rinehart’s Hancock Prospecting.