Resumo

ROSAS, A.C.A  e  MORENO, J.R. Macrominerals in grasses and in bovine blood serum in ranches Cercado province, rainy season, Beni Bolivia 2009 - 2010. Rev.Cient.Agro.Amaz. [online]. 2015, n.5, pp. 29-37. ISSN 2307-9606.

The minerals are essential nutrients for animals and they influence on the production efficiency. The objective was to establish the macrominerals content in grasses and the same in bovine blood serum in ranches, Cercado province, Beni Bolivia (2009-2010). Fifty seven samples of grasses and 194 bovines were evaluated. The technique of Atomic Absorption Spectroscopy was used to determine phosphorous (P), calcium (Ca) and magnesium (Mg) in grasses; and in bovine blood serum the Selective Ion method. In grass the results showed P 0.198 %, Ca 0.210 % and Mg 0.167 %. In blood serum P 5,24 mg/ dL, Ca 10,62 mg/dL and Mg 2,82 mg/dL. The macrominerals level (P, Ca, Mg) on grasses were below minimum recommended; however the macromineral content in bovine blood serum was within acceptable level, except in five ranches with deficiencies. The grasses: Cañuela morada (Himenachne amplexicaulis), Leona (Eleochari sacutangula), Taropé (Pontedeira subovata) and Tangola (Brachiaria spp.) showed an adequate P concentration. Calcium concentration was optimal in Taropé and Leona. Then, only Cañuela blanca (Luziola peruviana) showed Mg above recommended level

Palavras-chave : calcium; grass; magnesium; phosphorous.