Beef cattle mineral nutrition the brazilian Pantanal: 2. Micronutrients in central Nhecolândia.
DOI:
https://doi.org/10.1590/S1678-3921.pab1989.v24.13818Keywords:
mineral deficiencies, loxicity, mineral supplementation, native pastures, cobalt, cupper, iron, manganese, molibdenum, zinc.Abstract
Analytical results of soils, water and native grasses collected in Nov/79, May/80 and Aug/80, and of cattle liver in the same occasions plus Feb/80, in the sub region of Nhecolândia, Pantanal, Brazil, are reported. Soils and grasses were sampled on five landscape units: forest, cerrado woodland, Elyonurus grassland, open grassland, and pond. The range of Co in soil was 0.09 to 0.20 ppm; Fe, 84 to 280 ppm; Mn, 5 to 116 ppm Me, 0.06 to 0,13 ppnl Zn, 0,2 to 1.6 ppm; only traces of Cu were registered. In waler, only Fe showed nutritional importance for caule, up to 1.9 mg/l in ponds. The range of nutrients in grasses was 1.0 to 14.9 ppm for Cu, 44 to 3844 ppm for Fe, 82 to 2563 ppm for Mn, and 31024 ppm for Zn. In liver, Cu varied from 68 to 700 ppm Fe from 69 to 3432 ppm, Mn from 6 to 174 pprn, Zn from 3 to 612 ppm, while Co and Mo (analysed only in Nov/79) varied between 0.6 and 1.8 ppm, and 1.2 and 3.1 ppm, respectively. The results suggest the possibility of iron and manganese toxicity during/after flooding, and of deficiencies of copper and zinc in certain seasons, in this subregion.
