For years , it has been believed that feed additives and medicated feed additives use in the animal agriculture industry contain antibiotics , hormones and chemical ingredients with heavy metals 長(zhǎng)期以來(lái),在養(yǎng)殖業(yè)的飼料中,人們添加抗生素激素及含有重金屬的化學(xué)添加劑,使畜產(chǎn)品的藥殘重金屬嚴(yán)重超標(biāo)。