Angus bulls on Hollin Farm near
Delaplane, Virginia, posture and fight for dominance in their group of males. The mature bulls weight over a ton.
Music is "Take Five" from "The Essential Dave Brubeck" available on iTunes and on CD.Video footage by my son Robert Davenport.

This video shows why bulls are hard to raise. They are so big and strong that when they fight, they destroy fences and buildings. We have had several bulls that broke their legs in these battles and had to be put down.

Usually a group of bulls will sort things out after a few days and don"t fight much after that. But introduce a new bull, and there is trouble.

Steers (being castrated) do not exhibit this competitive behavior to the extent that bulls do. Steers are easier to manage. Hence feedlots have steers or heifers but hardly ever bulls. However, steers grow slower than bulls and hence a general agricultural practice in the USA is to give them growth hormones in a small implant in their ear. This makes the steers grow and put on weight at the same rate as bulls. However, they never become as muscular as these bulls are.
We don"t give implants as part of our natural beef program.
http://hollinfarms.com/pages/beef.html
Angus bulls are generally not very aggressive toward people. Angus cattle are a British breed developed for beef. Their beef has more marbling (fat) than European or Indian/Africa breeds. They are "polled" (they are bred to have no horns) and this makes them less dangerous to people and to each other.
However, Angus cows can be dangerous when they have young calves and sometimes will chase you when they feel that their calf is threatened. I"ve been knocked down and Mimi was hit by a cow and flipped backwards over a barred wire fence.
I have put up a youtube doc "Tagging Calves, Dangerous Work".