SCHEDULE 1 General conditions under which farmed animals must be kept

27 Feed, water and other substances
(1) No other substance, with the exception of those given for therapeutic or prophylactic purposes or for the purpose of zootechnical treatment, may be administered to animals unless it has been demonstrated by scientific studies of animal welfare or established practice that the effect of that substance is not detrimental to the health or welfare of the animals.
(2) In sub-paragraph (1), “zootechnical treatment” (“triniaeth söotechnegol”) has the meaning given in Article 1(2)(c) of Directive 96/22/EEC concerning the prohibition on the use in stockfarming of certain substances having a hormonal or thyrostatic action and of beta-agonists.
OJ No L125, 23.5.96, p.3.