López Alonso M, Benedito J L, Miranda M, Castillo C, Hernández J, Shore R F
Departamento de Patoloxía Animal, Facultade de Veterinaria, Universidade de Santiago de Compostela, 27002 Lugo, Spain.
Vet J. 2000 Nov;160(3):259-66. doi: 10.1053/tvjl.2000.0503.
Copper and zinc are frequently added at high concentrations to pig diets as growth promoters. Livestock grazing pasture contaminated with pig slurry may, therefore, be at risk from excessive intake of these elements. High liver copper concentrations have been detected in cattle from the agricultural region of Galicia (NW Spain), especially where there is intensive pig farming. The aim of this study was to evaluate whether pig farming does affect accumulation of copper and zinc in cattle in Galicia. Hepatic copper and zinc concentrations in calves were elevated in areas with naturally high levels of these elements in the soil. The densities of young pigs (piglets and growing-finishing pigs), but not reproductive sows, also influenced copper accumulation in calves. Liver copper levels in calves were significantly and positively related to the density of young pigs in the region. In areas with the highest pig densities, more than 20% of the cattle analysed had hepatic copper concentrations that exceeded the potentially toxic concentration of 150 mg/kg fresh weight. There was no evidence that zinc accumulation in calves was affected by pig density.
铜和锌经常以高浓度添加到猪饲料中作为生长促进剂。因此，放牧在受猪粪污染牧场的家畜可能面临这些元素摄入过量的风险。在西班牙西北部加利西亚农业区的牛中检测到肝脏铜浓度很高，特别是在有密集养猪业的地方。本研究的目的是评估养猪是否确实会影响加利西亚地区牛体内铜和锌的积累。在土壤中这些元素天然含量高的地区，犊牛肝脏中的铜和锌浓度有所升高。幼猪（仔猪和生长育肥猪）的密度，而非繁殖母猪的密度，也影响犊牛体内铜的积累。犊牛肝脏中的铜含量与该地区幼猪的密度显著正相关。在猪密度最高的地区，超过20%的被分析牛的肝脏铜浓度超过了150毫克/千克鲜重的潜在中毒浓度。没有证据表明犊牛体内锌的积累受猪密度的影响。
