Disposition seems to be something that comes up in every breed discussion there is. So is it a heritable trait or a learned behavior and do you have hard facts associated with your opinion. I am not that old, but have spent my entire life literally envolved in ranching. Growing up we had some no good ornary rips that were dangerous for anyone to be around. I learned to handle cattle any way it took to get it done, lots of time that was pretty quick or on the end of a 30ft rope. Maturing quite a little, as well as working for lots of other people and a stockmanship class has taught me a better way. So, has genetics improved disposition or have we become more concerned with how we handle our cattle and found a better way. I say it is a learned behavior, I still handle cattle that are just as bad to today as the cows we ran when I was a kid. If you slow down and take your time you can do something with them, if you cowboy them it becomes a lot of work. I started fighting bulls when I was in college, I also took care of all the bucking stock. I hand fed bulls in a bunk that I didn't want to get caught by in the arena, they were the real deal. They also learned that when they were in the arena it was game on, feeding them with the exception of one or two you could walk right through them. I think you can off set most temperment problems with proper handling.