Animal perfomance and structural sward on Brachiaria brizantha cvs. Marandu and Xaraés pastures submitted under grazing intensities / Desempenho animal e estrutura do dossel de Brachiaria brizantha cvs. Marandu e Xaraés submetidos a intensidades de pastejo

AUTOR(ES)

Renata Santos Flores

DATA DE PUBLICAÇÃO

2007

RESUMO

The objectives were to evaluate the forage yield, the structural characteristics, the herbage intake, the grazing behaviour and beef cattle performance in the palisadegrass cvs. marandu and xaraés pastures submitted to three grazing intensities. The experiment was carried out at Embrapa Gado de Corte. The experimental period was from October 2005 to June 2006. The area was of 8 ha, divided in 12 paddocks of 0,67 ha. Two cultivars Marandu and Xaraés of palisadegrass and three grazing intensities, 15, 30 and 45 cm of sward height were evaluated. The experimental design was randomized block in a split plot arrangement and two replications. The main plot was constituted by cultivars and subplot the grazing intensities. The grazing was continuously stocking with variable stocking rate. Each paddock was grazed by three steers and regulating animals were utilized to adjust the sward heights. The sward heights were monitored twice per week. The grass was sampled each 28 days, to estimate the forage yield, the forage accumulation rate, the structural characteristics and the nutritive value. The animals were weighed each 28 days. The dry matter intake was estimated in the summer and the autumn, and the grazing behaviour in the summer. The forage accumulation and average daily gain decreased as the grazing intensities increased for both palisadegras cvs. xaraés and marandu. The forage intake for the animals in xaraés grass pasture was limited by the variation in the sward structure. With basis of the sward structural characteristics, forage intake and the productivity, these grasses require differentiated management. The marandu grass must be managed between 25 and 40 cm of height and xaraés grass at 40 cm.

ASSUNTO(S)

manejo de pastagem forage allowance forage accumulation pasture management consumo de forragem acúmulo de forragem oferta de forragem nutricao e alimentacao animal forage intake

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