On-line version ISSN 1678-4596
WUNSCH, Carolina et al. Macro minerals to beef cattle in the native pastures of Campos de Cima da Serra - RS, Brazil. Cienc. Rural [online]. 2006, vol.36, n.4, pp.1258-1264. ISSN 1678-4596. http://dx.doi.org/10.1590/S0103-84782006000400033.
The present study was conducted to determine the mineral status of natural range pastures of Campos de Cima da Serra region, State of Rio Grande do Sul, Brazil, in different months of the year, to compare them to beef cattle requirements (NRC, 1996). The project was led in twenty private farms, in Cambará do Sul county, on grazing areas without improvements (except burning) at the last twenty years. Pasture samples were collected at January, February, March April, May, July, September and December to determine its calcium, phosphorus, magnesium, sodium and sulphur levels. Effect of the season was verified on all analyzed minerals. The Ca and Mg contents on grass samples were higher than the less demanding beef cattle categories requirements. Mg levels were deficient for more demanding animal categories, like gestating and lactating cows. Ca levels were deficient for calves. However, P, Na and S contents were lower than required for beef cattle categories.
Keywords : beef cattle; minerals; native pasture; animal requirements; mineral nutrition.