I can’t comment much on how the Aussies do it although one of my good friends worked on cattle stations down there. I’m sure we talked about the differences between here and there when she was here in the states starting colts on a work visa but that was several years and many beers ago.
I find it a little disheartening to read many don’t understand and know how cattle are worked here in the states. It goes to show the large disconnect between farm/ranch to table.
In my neck of the woods the country is large, like Bluey’s, 20+ acres to an animal unit(AU). A set of pens and chute may be miles often 30+ depending on the time of year. Roping is the only way to doctor cattle no matter what the size. I rope anything from newborn calves to full grown bulls on a 900 lb. horse. Being smart and handling your rope and stock is the secret and the stress is less than trying to trail an animal miles when it is sick or injured. When we brand, vaccinate it is easier on them to throw them all in a corner of a large allotment. We can keep the calves on their moms rope and drag them out, brand, vaccinate cut nuts and and they run back to their moms, back on the tit sucking, no trailing for miles to a set of pens and hardly a few minutes separated from mom. Less stress equals less chance of weakened immune systems/sickness, makes for healthier happier calves.
I have never used a 4 wheeler to move cattle and most around here do not. We all do things that are fitting to our environment and a 4 wheeler doesn’t really work here. Dogs and horses. Different story for those who can run 20 head per an acre rather than 1.5 head per 20 acres. Roping horseback is still going strong here.