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The experiment was conducted at the experimental farm of the Federal University of Parana, in February, 1998, and investigated the effect of the different Cynodon grasses structure at the horse grazing. The Cynodon spp. cv Tifton 85, Cynodon nlemfuensis cv Tifton 68, Cynodon spp. cv Tifton 44, Cynodon nlemfuensis (¨Porto Rico¨) and Cynodon nlemfuensis (¨Estrela Roxa¨) grasses were distributed in parcels with 12 m2 in a completely randomized split-plot design with four replications. The parcels were divided in two kinds of patches (tall and short) demonstrated by plants height. Five grazing tests were done with mares, evaluating the number of bites allocated in each treatment. The preference was evaluated by bite number and tiller grazed on each treatment. The bite depth was measured using 20 marked tillers in each experimental unit. The animals showed preference for Tifton 85, followed by Coastcross 1, Tifton 68 and Tifton 44. The star grasses ¨Estrela Roxa¨ and ¨Porto Rico¨ were not preferred. Tifton 85 and Coastcross 1 with more leaves and less stems mass (P<0,05), and with tall patches and higher tillers, were preferred by mares. A linear relationship was found between the tiller height extended and the bite depth. The structure of Cynodon grasses like leaves mass, leaves/stems relation, patches and plants height are important for horse grazing preference.

PREFERÊNCIA DE EQÜINOS EM PASTEJO: EFEITO DA ALTURA DE DOSSÉIS DE GRAMÍNEAS DO GÊNERO CYNODON