Commission Implementing Regulation (EU) 2021/1426 of 31 August 2021 concerning the authorisation of serine protease produced by Bacillus licheniformis DSM 19670 as a feed additive for chickens for fattening (holder of the authorisation: DSM Nutritional Products Ltd., represented in the Union by DSM Nutritional Products Sp. z o.o.) (Text with EEA relevance)