Fróðskaparrit - 31.12.2000, Blaðsíða 176

180
PARASITES IN SHEEP IN THE FAROE ISLANDS
used to isolate fluke eggs from faeces. Five
grams of faeces were mixed thoroughly
with 10-15 ml of tap water. The suspension
was washed through two layers of gauze
into a conical sedimentation beaker. The
suspension was allowed to sediment for 10
minutes. The faeces were discarded, the
supernatant was sucked off, and the beaker
was filled with water and stirred. This pro-
cedure was repeated 2-3 times, until faecal
debris had sufficiently decreased. Approx-
imately 5 ml of sediment was then mixed
with two drops of 1% malachite green so-
lution, and left to sediment in a conical test
tube for 10 minutes. The sediment was
then placed on a slide for microscopic ex-
amination. The results were described as
infected or not infected.
Results
Abomasum (Table 2)
In the abomasum, Teladorsagia circum-
cincta, T. trifurcata and T. davtiani were
present in all 15 lambs. The average num-
ber was 2,839 per lamb (range: 300- 8,250),
fairly evenly distributed between the four
locations.
Location Numbers of lambs Larvae Teladorsagia Trichostron- gylus axei
Saksun 4 99 2.214 0
Havnardalur 4 474 3,661 0
Streymnes 4 357 4,087 7,392
Kollafjørður 3 708 1,290 18
Total mean 410 2,813
Table 2. The mean numbers of nematodes in
abomasum.
Talva 2. Miðaltal av rundormum í vinstur.
Trichostrongylus axei was also identified
in the abomasum. However, this species
was only found in lambs from two of the
four locations - only a few were found in
lambs from one location, and an average of
7,392 (1,818-12,627) per lamb was found
in another location. Larvae were found in
the mucosal membrane in all lambs. No at-
tempt was made to make any identification
of the larvae.
The mean proportion between larvae and
adult Teladorsagia spp. was 1:7.4.
Small intestine (Table 3)
Nematodirus battus and N. filicollis were
found in the small intestine of lambs from
all four locations. N. battus was present in
14 of the 15 lambs (range: 100-16,580) and
N. fdicollis was present in 14 of 15 lambs
(range: 193-9,153). From two of the loca-
tions, the majority was N. battus (95% and
74%); in one location, 82% were N.filicol-
lis, and in the fourth location, the numbers
were low, and there were almost similar
numbers of /V. battus and N. filicollis.
Location Numbers of lambs Nematodirus battus Nematodirus filicollis Trichostron- gylus vitrinus
Saksun 4 8,613 445 875
Havnardalur 4 1,093 4.994 7,425
Streymnes 4 2,979 1,033 14,900
Kollafjørður 3 381 511 2,700
Total mean 3,267 1,746 6.475
Table 3. The mean numbers of nematodes in the small
intestine.
Talva 3. Miðaltal av nmdormum í vilum.