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Table 1 Herd characteristics and PCR prevalence and seroprevalence of the ten farrow-to-finish farms included in the study

From: Influence of parity and reproductive stage on the prevalence of Mycoplasma hyopneumoniae in breeding animals in belgian farrow-to-finish pig herds

  Farm 1 Farm 2 Farm 3 Farm 4 Farm 5 Farm 6 Farm 7 Farm 8 Farm 9 Farm 10
Number of sows 450 960 430 270 370 2400 1600 400 280 1000
Breed Topigs20 Danbred Danbred Danbred Topigs20 - TN70 Topigs20 Danbred Danbred Hypor TN70
Batch farrowing system for the sows (…week system) 4 4 4 4 3 1 1 4 3 1
Average parity number 3.2 4.0 3.7 4.9 3.0 3.7 3.6 4.0 3.8 3.0
Purchase of gilts + + + + + + +
Quarantine for purchased gilts + N.A + + + + + N.A N.A +
Gilts purchased from Mhyo negative farm N.A + + N.A N.A
Duration of quarantine (weeks) 4 N.A 7 4 6 3 6 N.A N.A 5
Quarantine unit located in separate stable + N.A + + + + + N.A N.A +
Mhyo vaccination of gilts
 At the supplier +     +      +
 In the quarantine    + + + + +    +
 During rearing   +       +   
Mhyo vaccination of sows
First contact gilts-sows in insemination unit + + + + + + + + + +
Group housing after … days of gestation 28 28 25 25 28 3 28 28 35 28
Clinical signs of respiratory disorders
 Sows/gilts + + + + +
 Young piglets + + +
Mhyo positive TBS (%, number) 2.5
2/80
43.8
35/80
3.8
3/80
0.0
0/80
33.8
27/80
20.0
16/80
18.8
15/80
40.0
32/80
5.0
4/80
7.5
6/80
Mhyo seropositive animals (%, number) 66.3
53/80
92.5
74/80
76.3
61/80
73.8
59/80
87.5
70/80
91.3
73/80
85.0
68/80
93.8
75/80
32.5
26/80
95.0
76/80
  1. Mhyo: Mycoplasma hyopneumoniae; TBS: tracheobronchial swab; N.A.: not applicable; +: yes; −: no; Bold = five farms with the highest M. hyopneumoniae prevalence (≥ 18.8%)