Mineral composition of pastures in the North and Northwest regions of Rio de Janeiro State: 2. Manganese, iron, zinc, copper, cobalt, molybdenum and lead

Revista Brasileira de Zootecnia

Coelho da Silva, José Fernando³  Maldonado Vasquez, Hernan²  Thiebaut, José Tarcísio Lima²  Tebaldi, Fernando Luiz Henriques¹ 

[1] UFV;UENF, Campos dos Goytacazes;UENF

关键词: forage;    microelement;    pasture;    soil;    water     IntroduçãoExistem cerca de 17 elementos inorgânicos requeridos pelos bovinos;    dentre eles os macroelementos incluem cálcio;    fósforo;    magnésio;    potássio;    sódio;    cloro e enxofre e os microelementos;    cromo;    cobalto;    cobre;    iodo;    ferro;    manganês;    molibdênio;    níquel;    selênio e zinco;   

DOI  :  10.1590/S1516-35982000000200039

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

¾ The contents of Mn, Fe, Zn, Cu, Co, Mo and Pb of soil, predominant forage in the pastures and water, were studied in the North and Northwest regions of Rio de Janeiro State, during the dry (June-July) and rainy (December-January) seasons. Samples of soil, forage and water were collected in 12 different points of the regions, in predominant grazing areas, as determined by satellite photograph and according to different soil characteristics. The mineral contents of the sample extracts were determined by spectrometry, on a inductive plasma emission source apparatus. In both seasons it was found low levels of Cu and Zn in forage samples and the mineral contents of forages varied with the type of soil. The levels of Fe and Mn were higher than the requirements and deficiencies of Cu and Zn were found. The cobalt contents of forages were higher than cattle requirements. The analyzed microelements in water usually were very low when compared with the safety levels. It was concluded that the mineral contents in the water analyzed samples were within the safety margin for domestic animals.

【 授权许可】

CC BY-NC