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Changes in heavy metal contents in animal feeds and manures in an intensive animal production region of China

Animal PhysiologyEngineeringAnimal FeedsEnvironmental EngineeringAnimal NutritionAnimal ScienceHeavy Metal ContentsAgricultural EconomicsFeed EvaluationEducationMetal ContaminationTrace MetalManure ManagementEnvironmental ToxicologyFeed SafetyAnimal Waste Management