Departamento de Patología Animal, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain.
Departamento de Patología Animal, Facultad de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain; Centro Tecnológico Agroalimentario de Lugo (CETAL), 27002 Lugo, Spain.
Chemosphere. 2017 Oct;185:1048-1055. doi: 10.1016/j.chemosphere.2017.07.112. Epub 2017 Jul 24.
In humans the main route of exposure to toxic metals is through the diet, and there is therefore a clear need for this source of contamination to be minimized, particularly in food of animal origin. For this purpose, the various sources of toxic metals in livestock farming (which vary depending on the production system) must be taken into account. The objectives of the present study were to establish the profile of metal exposure in dairy cattle in Spain and to determine, by chemometric (multivariate statistical) analysis, any differences between organic and conventional systems. Blood samples from 522 cows (341 from organic farms and 181 from conventional farms) were analysed by inductively coupled plasma mass spectrometry to determine the concentrations of 14 elements: As, Cd, Co, Cr, Cu, Fe, Hg, I, Mn, Mo, Ni, Pb, Se and Zn. In conventional systems the generally high and balanced trace element concentrations in the mineral-supplemented concentrate feed strongly determined the metal status of the cattle. However, in organic systems, soil ingestion was an important contributing factor. Our results demonstrate that general information about the effects of mineral supplementation in conventional farming cannot be directly extrapolated to organic farming and special attention should be given to the contribution of ingestion of soil during grazing and/or ingestion of soil contaminated forage.
在人类中，接触有毒金属的主要途径是通过饮食，因此显然需要将这种污染来源降至最低，特别是在动物源性食品中。为此，必须考虑到畜牧业中有毒金属的各种来源（这因生产系统而异）。本研究的目的是确定西班牙奶牛的金属暴露情况，并通过化学计量（多元统计）分析确定有机和常规系统之间的任何差异。通过电感耦合等离子体质谱法对 522 头奶牛（341 头来自有机农场，181 头来自常规农场）的血液样本进行分析，以确定 14 种元素的浓度：砷、镉、钴、铬、铜、铁、汞、碘、锰、钼、镍、铅、硒和锌。在常规系统中，补充矿物质的浓缩饲料中通常较高且平衡的微量元素浓度强烈决定了牛的金属状况。然而，在有机系统中，土壤摄入是一个重要的影响因素。我们的研究结果表明，关于常规养殖中矿物质补充的影响的一般信息不能直接外推到有机养殖，应特别注意放牧期间摄入土壤和/或摄入受污染饲料时土壤的贡献。
