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portuguesObjetivou-se avaliar o desempenho e consumo de materia seca de bezerras manejadas em pastoreio rotativo, com intervalos de pastoreio definidos por duas somas termicas relacionadas a duracao de elongacao foliar de dois grupos funcionais de gramineas durante a estacao fria em pastagem natural. O delineamento experimental foi o de blocos completamente casualizados, com dois tratamentos e tres repeticoes de area na regiao central do Rio Grande do Sul, Brasil. Os tratamentos foram duas somas termicas: 375 e 750 graus-dias (GD), que determinaram os intervalos entre os pastoreios. Foram utilizadas trinta e seis bezerras de corte com idade media de 18 meses e peso corporal medio de 220±14kg. Durante todo o experimento, as bezerras receberam como suplemento grao de milho moido a uma taxa de 0,5% do peso corporal por dia, as 14:00 horas e tiveram livre acesso a suplementacao proteinada (45% PB). Nao houve diferenca para o ganho medio diario, ganho de peso por area e consumo de materia seca entre os tratamentos. A soma termica como intervalo de descanso entre os pastoreios mostrou-se uma alternativa de manejo para aumentar a taxa de lotacao. Palavras-chave: pastagem natural; graus-dia; suplemento; producao animal EnglishThe aim of this study was to evaluate the performance and feed intake of grazing beef heifers on two grazing intervals determined by thermal sum related to leaf elongation duration during cool season on natural grasslands. A complete randomized block design experiment with two treatments and three replications was conducted from May to September 2011 in the central part of the state of Rio Grande do Sul, Brazil. The treatments were two thermal sums calculated at 375 and 750 degrees-days (DD) to determine the intervals between grazing periods in a rotational grazing system. Thirty six beef heifers with average age of 18 months old and (initial body weight = 220±14kg) were used, all heifers received ground corn supplement at a rate of 5g kg-1 of body weight per day, at 2p.m., throughout the experiment and had free access to mineral and protein supplementation (450g kg-1 of CP). Similar average daily gain (ADG), beef production gain (BPG) and feed intake (FI), were obtained in both treatments. Leaf elongation duration is an alternative grazing management tool for improved animal production and to increase animal stocking rate. Key words: animal production; beef heifers rearing; grazing system.

Performance and feed intake of beef heifers on rotational grazing of natural grassland receiving protein and energy supplement in cool season