Table 1

Herd variables assessed by the questionnaire and distribution of the pen samples by the categories of the outcome variable
Number of pen samples by the categories of the outcome variable Number of pen samples by the categories of the outcome variable
1 2 3 1 2 3
HERD VARIABLES
Type of system Management of breeding sows
Open air 29 0 1 more than 90% external source 835 17 68
Intensive 1242 38 110 >90% home raised 189 10 21
Missing observations 229 8 13 10-90% home raised 476 19 35
Type of herd Control of rodents
Selection and Multiplication Unit 292 8 30 No 1254 42 114
Production Unit 1208 38 94 Yes 246 4 10
Region of the herd Source of semen
Alentejo 229 8 13 Insemination centre – IC 491 11 18
Centre 278 8 34 Own boar + IC 869 23 88
Lisbon and Tagus Valley 914 27 59 Boar from another herd 79 9 12
North 79 3 18 Missing observations 61 3 6
Type of production Source of replacement pigs
Farrow-to-weaners 164 5 21 Just own herd 585 14 41
Farrow-to-growers 250 7 13 Others sources 906 31 83
Farrow-to-finish 794 26 60 Missing observations 9 1 0
Missing observations 292 8 30 Number of finishers pigs/herd
Number of boars <100 263 3 14
<3 715 22 33 ≥100 1221 42 107
≥3 785 24 91 Missing observations 16 1 3
Number of sows Control of birds
<170 759 16 55 No 1192 34 94
≥170 741 30 69 Yes 308 12 30
Number of gilts Use of foot bath
<22 713 20 47 No 1017 38 85
≥22 787 26 77 Yes 483 8 39
Size of the herd (number of breeding pigs) Clothes for exclusive use in the herd
<203 759 16 55 Yes 1423 46 121
≥203 741 30 69 No 77 0 3
Management of breeding boars Herd replacement policy
more than 90% external source 606 24 70 Good 434 7 29
without boars or >90% home raised 735 15 40 Bad 1066 39 95
Biosecurity measures
10-90% external source or home raised 159 7 14 Yes 828 30 72
No 672 16 52

Legend: 1 (no Salmonella), 2 (serotype Typhimurium or serotype 1,4,5,12:i:-), 3 (other serotypes).

Correia-Gomes et al.

Correia-Gomes et al. BMC Veterinary Research 2012 8:226   doi:10.1186/1746-6148-8-226

Open Data