i'm not into running animals on land, but i think if you approach this gradually as you build up experience in running grazing animals you can recondition a paddock by having the animals trampling and breaking up the bracken, but also because their poops become fertilizer for the next generation of plants that will help the taller growth outcompete the bracken, in time. this is a summary, of course... smother what you can with organic matter, reseed taller plants to shade, encourage diversity and then graze it appropriately. sound feasible for not too much expense? perhaps. conditions can vary so much... what may work in one area may not work in another, etc.