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Ciência Rural

Print version ISSN 0103-8478

Abstract

SANTOS, Aline Bosak dos et al. Nutritive value of Rio Grande do Sul/Brazil’s native grasses, ranked according to functional typology under fire and grazing regimes. Cienc. Rural [online]. 2013, vol.43, n.2, pp.342-347. ISSN 0103-8478.  https://doi.org/10.1590/S0103-84782013000200025.

Aiming to determinate the nutritive value and functional types classification consistency, crude protein and in vitro digestibility analysis were performed in leaf blades of the most frequent native grasses, in central RS. Species were evaluated under fire and grazing regimes: unburned and grazing excluded area (UE), burned and grazing excluded area (BE), unburned and grazed area (UG), burned and grazed area (BG) between 2007/September and 2008/May at Universidade Federal de Santa Maria experimental area. Crude protein ranged from 4.5 to 10.7% and digestibility showed greater variation, from 37 to 69%. Grazing affected positively crude protein in all species (7.9% in grazed area and 5.6% inexcluded area). Fire use promoted increase in grasses average digestibility (50.5% in burned area and 46.6% in unburned area). Crude protein and digestibility confirmed functional typology based in leaf traits, dry matter content and specific leaf area, based on which species are classified. Disturbances, grazing and fire, affect leaf blade nutritive value of several native grasses. Grazing increase mainly crude protein and fire increase digestibility.

Keywords : burning; digestibility; natural grassland; crude protein; quality.

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