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The effects of rest periods (14, 21, 28, 35, 42 and 49 days) on green dry matter (GDM) yield, chemical composition and morphogenetic and structural characteristics of Urochloa brizantha cv. Xaraés were evaluated under natural field conditions. GDM yields and regrowth, medium blade length, leaf elongation and leaf senescence rate increased consistently with highest rest periods however the nitrogen, phosphorus, calcium, magnesium and potassium contents and leaf appearance rate decreased. Maximum GDM yields, number of leaves tiller-1, leaf elongation rate and leaf area index were obtained with rest periods at 40.8; 40.2; 26.2 and 48.2 days. These data suggest that grass grazing at 35 to 42 days of rest period were optimal for obtain maximum yields and regrowth of rich forage.

Dinâmica do acúmulo de forragem e morfogênese de Urochloa brizantha cv. Xaraés sob períodos de descanso