Magadlela et al. conducted a field experiment using goats (Capra spp.) or sheep (Ovis spp.) separately or in combination to evaluate the effectiveness of grazing animals for brush clearing on hill land pasture. Goats reduced brush cover from 45% to 15% in one year, whereas sheep took three years to achieve the same result. Herbicides were used in combination with grazing on some treatments, and this primarily increased the effectiveness of sheep, but increased costs as well. Brush was cleared more cost effectively and rapidly by goats, but at the end of five years all treatments reduced brush cover to 2%.
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