Fróðskaparrit - 31.12.2000, Side 189

SNIKAR A SEYðl I FØROYUM
193
not found. This is a positive finding, as it is
considered to be a very important parasite
in sheep.
In general, the results indicate that para-
sites in sheep are widespread in the Faroe
Islands, and that their importance is not to
be underestimated. Most farmers treat their
sheep with anti-parasitic drugs two to three
weeks before lambing to reduce the peri-
parturient egg rise in mid-summer, and in
the autumn as well to free the sheep from
parasites before the winter.
Some farmers treat their animals in win-
ter, but the present study suggests that this
is not necessary, although there seems to be
high numbers of both Dictyocaulus filaria
and Muellerius capillaris larvae in faeces
(Fig. 6). The solution might be that farm-
ers could use anthelmintics if sheep are
coughing or if faecal samples are positive.
In general, the recommendations are that
faecal examinations should be used more
frequently in connection with anti-parasitic
treatment. Strategic management and anti-
parasitic medication do play an important
role in lowering the risk of both clinical and
sub-clinical parasitism.
Acknowledgements
I would like to thank the Føroya Landsstýri (the Faroese
Govemment) for financial support; Jesper Monrad,
Denmark; Sigurður H. Richter, Iceland; Eric Hoberg,
USA; Jústines Olsen, Elsu Petersen, and Dorete Bloch,
Faroe Islands for scientific support; and Lynda M. Gib-
bons, Department of Pathology and Infectious Diseases,
The Royal Veterinary College, University of London,
who verified identification of Teladorsagia circumcinc-
ta, T. davtiani, T. trifurcata, Trichostrongylus axei, T.
vitrinus, Nematodirus battus, N. filicollis, Trichuris
ovis, Oesophagostomum venulosum, and Dictyocaulus
fúaria.
I am also grateful to Jákup L. Samuelsen for techni-
cal assistance, and to the farmers who provided me with
the material that made this work possible.
References
Bjørk, E.A., 1956/57, Færøsk Bygderetl-Ill. Matrikul-
stovan. Tórshavn. 1984. 264-267.
Bloch, D. 1999. Villini súgdjór í Útnorðri. Tórshavn.
216.
Borgsteede, F.H.M., Hendricks, J. and van Der Burg,
W.P. 1978. Nematodirus battus in Nederland. Tijd-
schrift voor Diergeneeskunde 103: 279-280.
Cappelen, J. and Laursen, E.V. 1998. The Climate of
The Faroe Islands - with Climatological Standard
Normals, 1961-1990. Danish Meteorological Insti-
tute.
Christensen, N.O. and Nansen, P. 1976. The influence
of temperature on the infectivity of Fasciola hepat-
ica miracidia to Lymnea truncatula. J. Parasitol.
Oct 62:5: 698-701.
Crofton, H.D. and Thomas, R.J. 1951. A new species of
Nematodirus in sheep. Nature 168: 559.
Dicuil, 825. De Mensura orbis terrae. Tiemy, J.J. (ed.).
1967. The Dublin Institute for Advanced Studies.
74-77.
Dyrmundsson, O.R., Jónmundsson, J.V. and Richter,
S.H. 1996. Túnbeitartilraunir med sauðfe og kálfa á
Hvanneyri sumurin 1975-1979. Icel. Agr. Sci. 10,
1996: 219-240.
Effersøe, R.C. 1886, Landbruget og Husdyrbruget paa
Færøeme.
Gibbons, L.M. and Khalil, L.F. 1982. A key for the
identification of genera of the nematode family Tri-
chostrongylidae Leiper, 1912. Journal of Helmin-
thology 185-233.
Gibson,T. E. andEverett, G. 1981. Ecology of the free-
living stages of Nematodirus battus. Research in
Veterinary Science 31: 323-327.
Gulland, F.M.D. 1992. The role of nematode parasites
in Soay sheep (Ovis aries L.) mortality during a
Population crash. Parasitology 105:493-503.
Gulland, F.M.D. and Fox, M. 1992. Epidemiology of
nematode infections of Soay sheep (Ovis aries L.)
on St. Kilda. Parasitology 105: 481-492.
Hansen, J. and Perry, B. 1994. The Epidemiology, Di-
agnosis and Control of Helminth Parasites ofRumi-
nants. The Intemational Laboratory for Research on
Animal Diseases, Nairobi, Kenya.
Helle, O. 1969. The introduction of Nematodirus battus
(Crofton and Thomas, 1951) into a new environ-
ment. VetRec. 84: 157-160.