Commission Regulation (EC) No 652/2001 of 30 March 2001 amending Regulation (EC) No 23/2001 laying down special measures for the beef sector that depart from the provisions of Regulation (EC) No 800/1999, Regulation (EEC) No 3719/88, Regulation (EC) No 1291/2000 and Regulation (EEC) No 1964/82