Don't know if this goes along with the topic, but I've often thought about crossing cattle until a much smaller breed could be achieved. (think sheep size. 200lbs top weight) So that smaller farms could enjoy beef and the cow milk without having to support a 1000lb animal.

You may have something there . There are dwarf breeds of cattle I do not know how small they are. A goat is considered "a poor mans cow" . There are breeds of goats and sheep that give milk . Good Luck anyhow because they still do not taste like beef.

I've seen "mini cows" and they top out at about 500lbs. Yet for my "thinking" that would still be too big. I actually love goat meat. Growing up I barely knew pork BBQ it was always goat.

You may be better off with goats if you want something that small.The largest goat is the markhor 71 to 240 lb).
But there was a guy in the 1960's who developed mini horses, donkeys and later mules . So you still could succeed .