The demand for poultry (chickens and turkeys, at any rate) are so great that intensive, or battery production have become almost mandatory.
So-called organic chickens in the U. S. and Canada may be confined except for a couple of hours in movable enclosures and still qualify for the label.

Gnu, we also avoid shellfish (prawns, "shrimp") from SE Asia. The markets are full of them, frozen.
These prawns are raised in the rice fields when the fields are flooded; thus rice and shellfish are produced from the same land. Any material added to promote the one can be incorporated into the other.

In my supermarket, there is a separate frozen section where prawns raised in North America are kept. The price is a multiple of that for the Asian, so we eat shellfish only very occasionally.