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Table 1 Dairy cows excreting D. viviparus larvae (positive farms are marked in bold), BTM ELISA results (available for autumn only) and occurrence of coughing (our own and farmers’ observations; data available for autumn only)

From: The effect of patent Dictyocaulus viviparus (re)infections on individual milk yield and milk quality in pastured dairy cows and correlation with clinical signs

Herd Cows excreting lungworm larvae/total cows (%) BTM ELISA ODR value Occurrence of coughing and larvae excretion in autumn 2015
No. Size Summer 2015 Autumn 2015   Farmer observation Our observation
Occurrence of coughing Occurrence of coughing No. of coughing cows/total cows (%) No. of coughing cows positive for larvae excretion
1 82 0/59 (0) 0/74 (0) 0.125 + 1/74 (1.4) 0
2 65 0/55 (0) 0/54 (0) 0.120 + 2/54 (3.7) 0
3 215 7/164 (4.3) 23/195 (11.8) 0.342 + + 25/195 (12.8) 3
4 90 0/70 (0) 0/80 (0) 0.230 + 7/80 (8.8) 0
5 105 0/74 (0) 0/58 (0) 0.118 + 1/58 (1.7) 0
6 70 1/68 (1.5) 8/53 (15.1) 0.236 + 1/53 (1.9) 0
7 80 0/54 (0) 0/54 (0) 0.139 0/54 (0) 0
8 57 0/54 (0) 0/54 (0) 0.165 0/54 (0) 0
9 70 nd 4/50 (8.0) 0.196 + + 4/50 (8.0) 0
10 16 0/15 (0) 0/15 (0) 0.113 0/15 (0) 0
11 79 1/75 (1.3) 0/72 (0) 0.127 + 5/72 (6.9) 0
12 71 0/60 (0) 0/67 (0) 0.132 + 6/67 (9.0) 0
13 32 0/26 (0) 0/31 (0) 0.146 0/31 (0) 0
14 31 0/30 (0) 0/27 (0) 0.216 + 0/27 (0) 0
15 48 0/44 (0) 0/44 (0) 0.148 + 2/44 (4.6) 0
16 77 0/76 (0) 0/68 (0) 0.148 + 6/68 (8.8) 0
17 40 0/36 (0) 0/32 (0) 0.152 + + 1/32 (3.1) 0
Total 72.2a 9/960 (0.9) 35/1028 (3.4) 0.168a 4 CS+ / 13 CS- 12 CS+ / 5 CS- 61/1028 (5.9) 3/61 (4.9)
  1. Abbreviations: CS+ coughing positive, CS- coughing negative, nd not determined
  2. aMean, bbased on our observation; Farms with a positive coproscopy were marked in bold