Commission Implementing Regulation (EU) 2019/1290 of 31 July 2019 amending Implementing Regulation (EU) 2018/338 as regards the minimum content of a preparation of 6-phytase, produced by Aspergillus niger (DSM 25770) as a feed additive for chickens for fattening or reared for laying (holder of authorisation BASF SE) (Text with EEA relevance.)