经过评估，专家小组认为在建议使用水平（奶牛每�?mg铬来自Availa ?Cr；大�?.4mg�?kg全价饲料）是安全的，但无法确定其有效性。部分原文报道如下：

　　Following a request from the European Commission, EFSA was asked to deliver a scientific opinion on the safety and efficacy of Availa ?Cr （active compound: chromium chelate of DL‐methionine� as a feed additive for dairy cows. The EFSA Panel on Additives and Products or Substances used in Animal Feed （FEEDAP� Panel was assigned to this mandate. The tolerance study did not show adverse effects with respect to body weight, milk yield, haematology and blood biochemistry up to the 10‐fold overdose of chromium from Availa ?Cr; however, owing to deficiencies in design and reporting of the study, it provided o nly supportive evidence on the safety of the additive. A safe level for dairy cows could be derived from a toxicological study with laboratory rodents. Taking all together, the FEEDAP Panel co nsiders the maximum recommended use level �? mg Cr from Availa ?Cr/cow per day; a bout 0.4 mg Cr/kg complete feed� as safe. Chromium DL‐Met shows a genotoxic activity in vitro that is not expressed in vivo after systemic exposure; although no data on genotoxicity at the site of co ntact are available, the Panel notes that chromium（III� is not carcinogenic and co ncludes that chromium DL‐Met is unlikely to pose a carcinogenic risk at levels occurring in the diet.

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