My two sense. Take a beefalo, use a 1/2 wood bison, 1/2 plains bison animal crossed with a black gelbvieh. Then use the females out of that cross and breed them with a 1/2 horned hereford, 1/2 welsh black bull. U get the disease resistance you are looking for, easy keeping, and do ability of the bison, the milk, growth, and gain of a gelbvieh, the mothering, hardiness, docility, and sheer good looks of the horned hereford, and you get the thickness, hair, docility and carcass quality from the welsh black. Its a cross I am starting to work on that I think has some real merit. Not for everybody but I think they will do for me.