Table 1

Prevalence and seasonal abundance of trichostrongylid eggs (excl.Nematodirus spp) in faecal samples from ewes and lambs in organic sheep flocks in Sweden. Ewes were sampled in spring (April – May) and autumn (September – October) and lambs were sampled in summer (June) and autumn (September – October).
Year & season
 Flock prevalence (%)
 Mean EPG
 Genera prevalence




AM
 GM*
 H.contortus
 Teladorsagia
 Trichostrongylus
 Cooperia








EWES






Spring


%
 %
 %
 %
1997 (72) 21•
 93
 652
 393a
 24
 93
 74
 3
1998 (101) 15
 95
 244
 107b
 15
 92
 89
 0
1999 (93) 18
 98
 373
 195c
 18
 85
 83
 5
Autumn






1997 (60)
 40
 32
 3a
 5
 27
 22
 2
1998 (74)
 78
 53
 8b
 4
 31
 37
 0
1999 (66)
 77
 46
 7b
 8
 33
 61
 6
LAMBS






Summer






1997 (66) 7⊗
 88
 180
 85a
 2
 88
 55
 3
1998 (81) 17
 89
 186
 87a
 5
 69
 69
 4
1999 (74) 9
 80
 122
 66b
 9
 52
 39
 0
Autumn






1997 (60)
 70
 269
 119a
 7
 68
 53
 0
1998 (73)
 93
 384
 189a
 11
 63
 77
 18
1999 (66)
 97
 287
 140a
 17
 45
 74
 14

AM = Arithmetic mean; GM = Geometric Mean

* Comparisons between years. Means with the same superscript, within each subset, were not significantly different (p > 0.05)

• Number of ewe flocks that were dosed with an anthelmintic, following the detection of H. contortus

⊗ Number of flocks where lambs were dosed with an anthelmintic

Lindqvist et al. Acta Veterinaria Scandinavica 2001 42:377   doi:10.1186/1751-0147-42-377