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EnglishRemnant areas of Pampas grassland have a distinct double structure. Efficiency of livestock farming on these grasslands depends on practices that are synchronized with natural variation. This study examined the changes in vegetation composition and forage mass during winter to understand the effects of grazing methods in a natural pasture with a double structure that was grazed by heifers. An experimental area in the municipality of Bage, Rio Grande do Sul, was subjected to continuous or rotational grazing treatments, with two replicates each. Frequency of the structural composition and forage mass of the lower stratum and animal weight was measured at the beginning and end of the experimental period (June 7 to October 7, 2016, respectively). Data were analysed with PCA ordination, regression and variance analysis. Both structural composition and forage mass changed during the experimental period. Axonopus affinis and Paspalum notatum were characteristic of continuous grazing, while Mnesithea selloana and Axonopus argentinus characterized rotational grazing (the latter had the highest levels of forage mass). Although, grazing methods changed the composition of forage mass in winter, they did not affect average daily gain of the animals. Key words: forage allowance; grazing; heifers; native grassland portuguesAreas remanescentes de campo nativo do bioma Pampa tem apresentado dupla estrutura acentuada. A eficiencia da pecuaria sobre tais condicoes e dependente da adocao de praticas sincronizadas as peculiaridades naturais. Objetivou-se ampliar a compreensao da mudanca da composicao da vegetacao e da massa de forragem, durante a estacao de inverno, como efeito do manejo do pastejo em uma pastagem natural, de acentuada dupla estrutura pastejada por novilhas. A unidade experimental, situada no municipio de Bage, Rio Grande do Sul, consiste em dois tratamentos (pastoreios continuo e rotativo) e duas repeticoes. Os dados foram obtidos no inicio (7/6/2016) e fim do periodo experimental (7/10/2016), sendo estes: frequencia da composicao estrutural e do estrato inferior, massa de forragem deste estrato e peso dos animais. Os dados foram analisados com metodos multivariados, regressao linear e comparacao de medias. A composicao da estrutura e da massa de forragem se alterou no periodo. Axonopus affinis e Paspalum notatum representaram o pastoreio continuo; e Mnesithea selloana e Axonopus argentinus o pastoreio rotativo, estando esta ultima especie relacionada aos maiores niveis de massa de forragem. Na estacao hibernal, os metodos de manejo interferiram na composicao da massa de forragem sem interferir no desempenho positivo dos animais. Palavras-chave: campo nativo; oferta de forragem; metodo de pastejo; recria de novilhas

Vegetation composition and forage mass in grassland with a double structure under two winter grazing regimes