Question- Are the cows still in the pasture or have you moved them already? Are you already feeding them in this pasture?
One radical idea I would try is too use poly wire and confine them to a much smaller area, thereby increasing your stock density. If the terrain and water access allows, this will be the much cheaper way to go. Make the cows do the work. Next spring you'll probably see some neat things start to happen. More grass will grow where the cows were confined and spread all their dung and manure. They'll also trample all of the old dead grass, and put it in contact with the soil where it can do some good. It will act like mulch and help save water. It will also feed the earth worms and soil microbes so you can grow more grass in the future. It makes no sense to mow it, where it will shade out any new seedlings. It makes even less sense to burn it and turn all that organic matter into smoke to blow away. Not to mention the huge liability it is to start a fire with houses so close.