Agronomic characteristics and viability of tifton-85 (Cynodon spp) irrigated in the milk production system
AbstractThe experiment was carried out to evaluate the irrigation viability of a Tifton-85 pasture and the sward productivity. Two areas of 3.54 ha (with or without irrigation) were divided in eight paddocks of 4.430 m² and a grazing method of rotational stocking was used. During the summer these areas were fertilized with 200 kg of N/ha. The pasture irrigation system increased the green leaves production, 2,249 vs 1,443 kg of DM/ha, the leaf:stem ratio, 0.37 vs 0.26, the CP content in the whole plant and leaf, 8.49 vs 6.67 and 14.78 vs 12.94, respectively and reduced the percentage of ADF in the whole plant, 44.87 vs 46.15. The milk production in kg/animal/day (9.92 and 10.05) and in kg/ha (1,195 and 1,215) did not differ in the systems with and without irrigation. In both treatments milk production in kg/ha increased from April to July in comparison with the period from December to March (with irrigation, 1,302 vs 1,088 and without irrigation, 1,403 vs 1,028). The reduction of expenses with the corn silage (8.82 t) and sugarcane (3 t) was not enough to compensate the expenditure with energy.
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