(19)

(11)

EP 0 599 856 A1

(12)

(43) Date of publication: 08.06.1994 Bulletin 1994/23 (21) Application number: 92913502.0 (22) Date of filing: 22.06.1992

(51) International Patent Classification (IPC):  A01K 1/ 00( . ) A23K 1/ 00( . ) A01K 5/ 02( . ) A23K 1/ 18( . ) (86) International application number: PCT/GB1992/001134 (87) International publication number: WO 1993/000017 (07.01.1993 Gazette 1993/02)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 22.06.1991 GB 19910013546 14.05.1992 GB 19920010332 (71) Applicant: THE UNIVERSITY OF LEEDS Leeds, West Yorkshire LS2 9JT (GB)	(72) Inventors: FORBES, John Michael 1 The Woodlands Otley LS21 1JY (GB) YALDA, Akram Leeds (GB) (74) Representative: Browne, Robin Forsythe, Dr., et al  Urquhart-Dykes & Lord Tower House Merrion Way Leeds LS2 8PA West Yorkshire Leeds LS2 8PA West Yorkshire (GB)