Full Length Research Paper
Authors
H. Hauge
Norwegian Veterinary Institute, P. O. Box 750 Sentrum, 0106 Oslo, Norway.
M. K. Dahle
Norwegian Veterinary Institute, P. O. Box 750 Sentrum, 0106 Oslo, Norway.
A. B. Kristoffersen
Norwegian Veterinary Institute, P. O. Box 750 Sentrum, 0106 Oslo, Norway.
S. Grove
Norwegian Veterinary Institute, P. O. Box 750 Sentrum, 0106 Oslo, Norway.
C. R. Wiik-Nielsen
Norwegian Veterinary Institute, P. O. Box 750 Sentrum, 0106 Oslo, Norway.
T. Tengs*
Norwegian Veterinary Institute, P. O. Box 750 Sentrum, 0106 Oslo, Norway.
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