Características do pasto e desempenho de novilhas F1 Holandês x Zebu em capim-marandu sobressemeado com forrageiras de inverno, na transição seca-águas

Abstract

The objective of this work was to evaluate the productive and structural characteristics of the pasture and the performance of heifers, kept in pastures of marandu grass overseeded with combinations of winter forages in the drywater transition period. With a completely randomized design and subdivided plots scheme, with three replications, three types of pastures were studied: marandu grass in exclusive cultivation; Marandu grass overlain with mixture of white oats, black oats and ryegrass and Marandu grass overgrown with white oat mixture and legumes, white clover and red clover grazed with heifers F1 Holstein x Zebu in intensive production system (irrigation, fertilization and rotational stocking) over three cycles of grazing (August, September and October). The mean total forage mass in pregrazing (6,389.27 kg.ha-1 DM) and the average forage mass of the marandu grass (4 984.03 kg.ha-1 DM), were higher in the cycle of Grazing in October. On the other hand, forage masses of ryegrass and clover mix were higher in the grazing cycle in September, 399.10 kg.ha-1 DM and 167.79 kg.ha-1 DM, respectively. The exclusive marandu grass pasture, in the grazing cycle in October, also presented the highest foliar leaf mass of 3,180, 79 kg ha-1 of DM. Greater forage accumulation (4,445.80 kg.ha-1 DM) and higher daily forage accumulation rate (158.78 kg.ha-1 DM day) occurred in the grazing cycle in August, regardless of the pasture types. The highest daily weight gain of heifers was verified in the cycle in September (0.765kg day -1 ) and October (0.658 kg day -1 ), regardless of the pasture types. The production of winter forages did little to contribute to the forage mass of the overgrown pasture. Pastures of marandu grass fertilized and irrigated, overseeded with winter forages, during the transition period dry-water, are equivalent to nonoverseeded pastures.