# Regulation (EC) No 1831/2003 of the European Parliament and of the Council of 22 September 2003 on additives for use in animal nutrition (Text with EEA relevance), Division 4: In the category ‘zootechnical additives’, the following functional groups are included:

Extent: E+W+S+N.I.

(a) digestibility enhancers: substances which, when fed to animals, increase the digestibility of the diet, through action on target feed materials;
(b) gut flora stabilisers: micro-organisms or other chemically defined substances, which, when fed to animals, have a positive effect on the gut flora;
(c) substances which favourably affect the environment;
(d) other zootechnical additives;
(e) physiological condition stabilisers: substances or, when applicable microorganisms, which, when fed to animals in good health, favourably affect their physiological condition, including their resilience to stress factors.

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Source: https://www.legislation.gov.uk/eur/2003/1831/annex/I/division/4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2003-1831/annex-I/division-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.