There is an experimental farm in The Netherlands called the floating farms. It is cattle production on the water with the concept of it being fully self sustaining.
Cows are housed in pens over water and can go down to muddy grassland, but for the most part stay put and munch on grass from soccer fields or golf clubs or rejected fruits and vegetables from the food depot.
I think this is posh factory farming. It is just experimental. It still makes me cringe.
The world around me 