Article 5
Notwithstanding Article 3 (a) and without prejudice to Article 2, Member States may authorize the administering to farm animals, for the purpose of zootechnical treatment, of veterinary medicinal products having an oestrogenic, androgenic or gestagenic action which are authorized in accordance with Directives 81/851/EEC and 81/852/EEC. Such veterinary medicinal products must be administered by a veterinarian to clearly identified animals; the treatment must be recorded by the veterinarian responsible in accordance with point 1 of Article 4. However, Member States may allow the synchronization of oestrus and the preparation of donors and recipients for the implantation of embryos to be effected not by the veterinarian direct, but under his responsibility. With regard to aquaculture animals young fish may be treated for the first three months for the purpose of sex inversion with veterinary medicinal products that have an androgenous action and are authorized in accordance with Directives 81/851/EEC and 81/852/EEC. In the cases provided for in this Article, the veterinarian shall make out a non-renewable prescription, specifying the treatment in question and the quantity of the product required and shall record the products prescribed. However, zootechnical treatment of production animals, including during the fattening period for breeding animals at the end of their reproductive life, shall be prohibited.