I honestly think there is a huge difference between the grain feeding that happens in the US and what happens in Australia.
Come and look at the farms in the dairy regions, they are not all locked up being force fed grains. They are grazing on grasses, weeds etc during the day. They get silage/hay during winter, which is cut from the same grasses that they have already been eating. And guess what, some of those grasses have grains.

To me the is a huge difference between occasional and all the time. Imagine the green miles involved in getting butter from other countries as they are labeled "grass fed" Honestly it reminds me of all the mis information flying around about "permeate free" milk.