28. Administration is in accordance with this regulation if—
(a)it is of an authorised veterinary medicinal product having an oestrogenic, androgenic or gestagenic action for the purpose of zootechnical treatment of a clearly identified animal other than a production animal;
(b)it is carried out, in the case of the synchronisation of oestrus or the preparation of donors or recipients for the implantation of embryos by, or under the direct responsibility of a veterinary surgeon, and in any other case, by a veterinary surgeon;
(c)the veterinary surgeon who carries out, or who is responsible for, the administration makes an appropriate record of the treatment and makes out a non-renewable prescription specifying the treatment in question and the quantity of the product required; and
(d)in the case of the treatment of aquaculture animals for the purpose of sex inversion, it is of an authorised veterinary medicinal product having an androgenous action and carried out on a fish aged 3 months or less.