Swath Grazing

Lovely picture. One strand of electric fence. Those must be very well trained cows, and closely supervised to boot.

"More labor intensive" sounds like an understatement. If the cows will respect your portable fencing, fine; but thats "pet" grade training. The more independent minded bovines are likely to challenge any fence once the see a bite of grass they want on the other side of it. Or have an itch.