When Simmental's first appeared in our area many years ago, everyone was totally impressed with their growing ability, but the problem with the first seed-stock was they were totally batty, and wilder than a deer.
From what I have been told ( don't know if it true or grapevine) there were three different types of sentimental imported into Canada. I was told that one of the types was a dairy type sentimental, that was used for milking in Europe. i have seen semmi cattle that were more bony- like a dairy cow, so maybe it is true, and maybe that is why there are differences in temperament in different areas.
I am sure nowdays that some breeders are very careful about breeding decent tempered animals,
but in my observation is that the "modern" sentimental is MUCH different than the old style sentimental.
they even look different as alot of red angus blood has been introduced, and the style of animal has dramatically changed.
You can often tell by look whether it is the modern Semmi or the old style, bloodlines they look that different.