1. Prof. Dr. E.J. Ruitenberg,
Chairman of the executive Board,
Scientific director,
C.L.B., Plesmanlaan 125, 1066 CX,
Amsterdam,
The Netherlands.

2. Prof. Dr. Zwart,
The Agricultural University,
P. O. Box 9101,
6700 H Wageningen,
The Netherlands.

3. Dr. P.K. Das,
Dermatology department,
Faculty of Medicine, University of Amsterdam.
The Netherlands.

4. Prof. Dr. M.T.A. Shigidi,
Faculty of Veterinary Medicine,
Khartoum North, P.O. Box 32,
The Sudan.

1- Member of the Sudanese Veterinary Association (now known as Sudanese Veterinary Trade Union)