(35)The marks of an equine animal and the means of identification applied to it, which in combination are used for the purpose of identity verification, should not only establish an unequivocal link between the equine animal and its identification document, but should also show that this equine animal has undergone the process of identification in accordance with this Regulation so that not more than one identification document is issued in respect of a single animal. Electronic identifiers (‘transponders’) for equidae are already used widely at international level. That technology should be used to ensure a close link between the equine animal and its identification document, although provision should be made for alternative methods to be used for the verification of the identity of the equine animal provided that those alternative methods deliver equivalent guarantees to prevent multiple issuing of identification documents.