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).