We have two sheep neighbours both big commercial boys and both seem to do things differently (peering over the hedge, not that they give us advice). One mobs his fields and moves them off quickly - probably every 2 weeks. The other has all his fields open so the sheep free roam (about 50 acres I think), but I have rarely seen the fields without sheep in them. I do see more limping sheep in the latter (his is also rented lands, the other owns theirs). Neither field seems to have much grass to my untrained eye, but their fields have greened up quicker than ours so, they must be doing something right.
I have been trying to get head round stocking rates and rotation. Think what I want to do is achieve both things mentioned here ie balance the field/paddock size and stocking nos so the grass is grazed down quickly to optimum length to allow sheep to move onto the next field/paddock and avoid worm/foot problems. When I did my into to sheep course, they mentioned that traditional farmers say sheep shouldn't hear church bells twice on the same piece of ground ie move on within 2 weeks. Maybe for the next field subdidvide with temp elec fencing to achieve this? My rotation plan involves 2 acres paddocks but I will have double your no of sheep, plus a few horses. Ignoring one field safeguarded for tupping/lambing/stable paddocks, I've got six to rotate around for summer grazing. Don't know if it will work, but will give it a try but hoping each paddock will get a month's respite in between horses or sheep grazing for grass growth and 10 weeks for worms/foot bacteria to die off.