Commission Implementing Regulation (EU) 2023/669 of 22 March 2023 concerning the authorisation of a preparation of endo-1,4-beta-xylanase produced by Komagataella phaffii DSM 33574 as a feed additive for all poultry species for fattening and all poultry species reared for laying and reared for breeding (holder of authorisation: BioResource, international, Inc. represented in the Union by Pen & Tec Consulting, S.L.U.) (Text with EEA relevance)
Data as of 2026-07-04 · Compiled from an official source version. Later amendments or repeals may not be reflected; the official text prevails. · Read the official text ↗
The preparation specified in the Annex, belonging to the additive category ‘zootechnical additives’ and to the functional group ‘digestibility enhancers’, is authorised as an additive in animal nutrition, subject to the conditions laid down in that Annex.
This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.
ANNEX Identification number of the additive Name of the holder of authorisation Additive Composition, chemical formula, description, analytical method Species or category of animal Maximum age Minimum content Maximum content Other provisions End of period of authorisation Units of activity/kg of complete feedingstuff with a moisture content of 12 % Category of zootechnical additives. Functional group: digestibility enhancers 4a35 BioResource International, Inc. represented in the Union by Pen & Tec Consulting, S.L.U. Endo-1,4-beta-xylanase (EC 3.2.1.8) Additive composition Preparation of endo-1,4-beta-xylanase (EC 3.2.1.8) produced by Komagataella phaffii DSM 33574 with a minimum activity of: 150 000 XU ( 1 ) /g Solid form Characterisation of the active substance Endo-1,4-beta-xylanase (EC 3.2.1.8) produced by Komagataella phaffii (DSM 33574) Analytical method ( 2 ) For the determination of endo-1,4-beta-xylanase activity in the feed additive: colorimetric (DNS) method based on the enzymatic hydrolysis of the beechwood xylan substrate. For the determination of endo-1,4-beta-xylanase activity in compound feed: colorimetric method based on the enzymatic reaction of endo-1,4-beta-xylanase on the Xy1X6 substrate. All poultry species for fattening All poultry species reared for laying or reared for breeding purposes — 10 000 XU — 1. The additive shall not be used in premixtures. 2. In the directions for use of the additive, the storage conditions and stability to heat treatment shall be indicated. 3. For users of the additive, feed business operators shall establish operational procedures and organisational measures to address potential risks resulting from its use. Where those risks cannot be eliminated or reduced to a minimum by such procedures and measures, the additive shall be used with personal protective equipment, including breathing, skin and eyes protection. 13.4.2033 ( 1 ) One XU unit is the amount of enzyme which releases 1 nano-mol of reducing sugar (xylose equivalent) per second from xylan of beechwood at 50 °C and pH 6,0. ( 2 ) Details of the analytical methods are available at the following address of the Reference Laboratory: https://joint-research-centre.ec.europa.eu/eurl-fa-eurl-feed-additives/eurl-fa-authorisation/eurl-fa-evaluation-reports_en
Source: EUR-Lex (Publications Office of the EU), © European Union, reuse permitted under Commission Decision 2011/833/EU.