Commission Implementing Regulation (EU) 2017/950 of 2 June 2017 amending Implementing Regulation (EU) No 1068/2011 as regards the minimum content of the preparation of endo-1,4-beta-xylanase produced by Aspergillus niger (CBS 109.713) and endo-1,4-beta-glucanase produced by Aspergillus niger (DSM 18404) as a feed additive for chickens reared for laying and all avian species for laying (holder of authorisation BASF SE) (Text with EEA relevance. )