NH homesteader
Herd Master
I am not a cattle person but this is very interesting. It's amazing (and awful) what we do to entire breeds of animals as a side effect of one thing we are trying to make easier or safer for ourselves.
Yes, we interfere a lot, but if we had not, beef breeds like Hereford would still be huge frame animals. One of the reasons we see so many horned herefords that are a larger frame, is that there are fewer of them nowadys and those breeders are behind the curve somewhat in breeding down to a smaller frame animal.
You mentioned that we may be losing some hybrid vigor in general in our beef breeds, and I agree. That is because I think we have moved too far in selecting only British genetics and leaving out continental genetics--charolais, simmental, shorthorn etc.