Table 1 Productions characteristics of five breeding-to-nursery herds based on a questionnaire survey
Parameter | Herd A | Herd B | Herd C | Herd D | Herd E |
|---|---|---|---|---|---|
Neighborhood, pig density* | High | Low | High | High | High |
Sow herd | |||||
 Herd size (sow number) | 1800 | 1850 | 700 | 600 | 700 |
 Batch farrowing interval (weeks) | 1 | 1 | 4 | 4 | 3 |
 Suckling period (weeks) | 4 | 4 | 3 | 3 | 4 |
 Nurse sow system | Yes | Yes | no | No | Yes |
 C&D* between batches | Yes | Yes | Yes | Yes | No |
 Sow herd influenza A vaccination interval | None | 4 months | 3 months | 4 months | 3 to 4 months |
 Influenza A vaccine | None | Respiporc® FLUpan, Ceva Santé Animale, France Respiporc® FLU3,Ceva Santé Animale, France | |||
Gilt management | |||||
 Self-replacement | Yes | Yes | No | No | No |
 Quarantine location | Not required | Not required | Separate building | Separate building | Separate building |
 Quarantine period (weeks) | 6 | Not required | 5 | 8 | 6 |
 C&D* between batches | Yes | Not required | No | Yes | Yes |
 Influenza A vaccination (age) | None | 4 and 5 months | 6 months | 6 and 7 months | 6 and 7.5 months |
 Influenza A vaccine | None | Respiporc® FLUpan, Ceva Santé Animale, France Respiporc® FLU3, Ceva Santé Animale, France | |||
Nursery | |||||
 Rearing period (weeks) | 6–7 | 7 | 7 | 7–8 | 6–7 |
 Age groups per compartment | 1 | 1 | 1 | 1 | 1–3 |
 Density change | No | No | Yes | Yes | Yes |
 Pen size at weaning | 65 | 24 | 90 | 300 | 90 |
 C&D** between batches | Yes | Yes | Yes | Yes | Yes |
 Ventilation | Fresh air from outside via attic through ceiling and sheath; exhausted air outlet through the top | Fresh air from outside via service corridor through ceiling; exhausted air outlet underfloor | Fresh air from outside via service corridor through ceiling; exhausted air outlet through the top | Fresh air from outside via service corridor through ceiling and sheath; exhausted air outlet underfloor | Fresh air from outside via service corridor trough ceiling and sheath; exhausted air outlet through the top |
 Influenza A vaccination | None | None | None | None | None |
 PRRSV herd status (according to Holtkamp et al.,2021 [28]) | Category II-vx: positive stabile with vaccination | Category IV: negative | Category II-vx: positive stabile with vaccination | Category I-B: positive unstable, low prevalence | Category II-vx: positive stabile with vaccination |
 PRRSV vaccination | Piglets and sows | None | Piglets, gilts and sows | Piglets, gilts and sows | Piglets, gilts and sows |
 Porcine Circovirus 2 vaccination | Piglets | Piglets and gilts | Piglets and gilts | Piglets and sow | Piglets and gilts |
 Mycoplasma hyopneumoniae vaccination | None | Piglets and gilts | Piglets | Piglets | Piglets and gilts |
 Actinobacillus pleuropneumoniae vaccination | None | None | Gilts | Gilts | Gilts |
 Bordetella bronchiseptica vaccination | Sows | None | None | None | None |
 Streptococcus suis vaccination | Sows | None | None | Sows | None |