I'm not sure if you got your answer. I was looking for this for similar reasons
It's called
perimeter fencing it has a 2x4 hole size. I had also visited several livestock and feed stores the other day and I couldn't find the larger stuff at the big box stores.
cattle panel is available here
http://www.kencove.com/fence/cattle+...FROVfgodYE0AUg
and as feedlot panel here
http://www.tractorsupply.com/webapp/...=&cm_vc=-10005
Gaston