Regulation (EU) 2018/1039 will forbid the use of high levels of copper (170 mg/kg) in the feed of piglets of up to 12 weeks of age as of:

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See a clue in the article Copper: new legislation, practical consequences in post-weaning feed

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The use of high levels of copper (170 mg/kg) in piglet fed will be allowed until August 13th, 2019. From there on, until 4 weeks after weaning, 150 mg/kg will be allowed, and from the 5th to the 8th week after weaning 100 mg/kg will be permitted.