The use of domestic grazers to shift the growth advantage toward shrubs is a commonly applied tool on winter ranges managed primarily for big game. Results from horses grazing in spring indicated grazing also benefits shrub survival, seedling recruitment, and reduced winter injury damage on some species of shrubs.
Austin, Dennis D. and Urness, Philip J.
"Effects of horse grazing in spring on survival, recruitment, and winter injury damage of shrubs,"
Great Basin Naturalist: Vol. 55
, Article 8.
Available at: http://scholarsarchive.byu.edu/gbn/vol55/iss3/8