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Dynamics of the elimination ofDicrocoelium dendriticum(Trematoda, Digenea) eggs in the faeces of lambs and ewes in the Porma basin (Léon, NW Spain)
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Abstract
The elimination of Dicrocoelium dendriticum eggs in sheep faeces from 4 localities
in the upper and middle Porma river basin was recorded at monthly intervals between
March 1986 and March 1987. The faecal material was taken directly from the rectum
of the animals (10% of the flock in each village). The sedimentation technique and
McMaster egg counting chambers were used to analyze the faecal samples. Of the 995
samples examined, 63.6% contained D. dendriticum eggs and the number of eggs per gram
(epg) varied from 33 to 5,340 (average 323.4 +/- 18.5). The highest elimination rate
was observed in winter, not only because of prevalence (90.5%) but also because of
the epg (average 726.6 +/- 88.4). Prevalence of infection (from 61.5 to 65.4%) was
similar for all age groups, although the highest mean epg value (367.6 +/- 50.9) was
found in lambs.