(36)Transponders used for the marking of equidae and the reading devices to display the code embedded in the transponder should comply with internationally agreed standards. Those standards provide for two different systems to ensure the uniqueness of the transponder code. The majority of Member States have implemented Regulation (EC) No 504/2008 in such a way as to use a three-digit alpha-numeric country code and to manage the distribution of the transponders through their competent authorities.