There was a point where we kept hearing how non-sustainable dairy cows were.
Sure, they can be. . .like everything and anything. . . if mismanaged, misbred, misused.
This came from non-dairy animal folks, to be sure, but I still assume that misinformation might circulate out there among those that do not know better.
Our dairy cow is 100% Jersey: 25% full size / 75% Miniature. She is about 45'' tall. Not very small, at all. . .but a great homestead, traditional Jersey size. Smaller than what folks generally see now, yes.
She hasn't needed wormed since we've owned her. Needs nothing but air, sunshine and grass. . .by and large
. . .and she gives us 12 lbs of milk on once a day milking like clock work. . .no fuss, no muss. Check out that amazing body condition, too. . .FOR A DAIRY COW.
If that isn't sustainable, call me Fred
I'd call her About the most useful creature on earth.
Be thou diligent to know the state of thy flocks, and look well to thy herds. For riches are not for ever: and doth the crown endure to every generation? The hay appeareth, and the tender grass sheweth itself, and herbs of the mountains are gathered. The lambs are for thy clothing, and the goats are the price of the field. And thou shalt have goats' milk enough for thy food, for the food of thy household, and for the maintenance for thy maidens
- Proverbs 27:23-27