As a general rule handling yearlings against older bred cows there is a difference. And I have noticed a difference between breeds but a huge factor is how they are handled. Whether it is 4 wheeler, truck, bale on a tractor, dogs, humans on foot or horseback they will act different if you introduce a new way of moving them.
Yearlings are a little tougher to handle, you have to push, move their feet and get them looking in the direction you want them to go, almost like you would moving a horse. Also leading them helps, especially with Holstiens, they can't seem to find a hole on their own, they have to be shown. We used to bawl to them, get them hooked on, and they would follow a horse into a set of pens, if you can get the first couple to come through the rest will follow....like a train, don't worry about the ass end, direct your lead steers/heifers/cows the rest will follow.
You might want to get them used to being pushed around horseback and respect a horse in the pasture before trotting them down the road and have to worry about controlling them on a busy road or gracefully getting them out of someones yard with out damage. Depending on the road, state or county you are in, it may require an escort, whether it be a county sheriff deputy or state trooper.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.