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Produ??o de novilhas de corte em pastagem de Coastcross-1 consorciada com Arachis pintoi com e sem aduba??o nitrogenada

DOI: 10.1590/S1516-35982009000100016

Keywords: animal performance, forage mass production, grazing cattle, stocking rate.

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Abstract:

this trial was carried out to evaluate forage mass (fm), daily accumulation rate (dar), forage offer (fo), stocking rate (sr), arachis pintoi percentage (app), average daily gain (adg) and gain per hectare (gph) of beef heifers under grazing in coastcross-1 and arachis pintoi mixed pasture during different seasons, from july 2003 to june 2004. the treatments were: ca0 = coastcross + arachis pintoi without n; ca100 = coastcross + arachis pintoi with 100 kg of n; ca200 = coastcross + arachis pintoi with 200 kg of n; and c200 = coastcross with 200 kg of n, distributed in a randomly block design, with two repetitions. pasture management was done through continuous grazing with variable stocking rate, using crossbred heifers with three test animals per treatment. the fm was 2641, 2431, 2760 and 2704 kg of dm/ha for ca0, ca100, ca200 and c200, respectively. treatments presented similar dar (66.12 kg of dm/ha) between pastures, with higher production in the summer, followed by spring and autumn, which were not different from each other, and the winter with the lowest value: 108.6; 71.7; 54.2; 30.6 kg of dm/ha, respectively. in the ca0 treatment, the highest fo and the lowest sr were obtained (4.0 au/ha). the highest sr and lowest fo were observed in treatments with nitrogen fertilization, without difference among them. the app in the mixture was higher in the spring, and for the ca0 treatment, with visual estimations were always higher in function of the lower dry matter percentage of this legume. for adg was higher for ca200 and c200 treatments in relation to ca100 and ca0 with values of 0.51, 0.51, 0.42 and 0.38 kg/day, respectively. the gph were above 1000 kg/ha/year and the summer presented the highest gain (221.4 kg/ha).

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