Table 1.
Pig herds of cooperative slaughterhouse Lihakunta with antibodies to Mycoplasma hyopneumoniae and which were later shown to be infected with the agent. The time of eradication of the agent is shown, too
| Herd | No. of sows | Production type | No. of colostral whey or serum samples | Time of eradication (month/year) | The follow-up serum samples after eradication | Notes | ||
| positiveb | total | positiveb | total | |||||
| Kar | 24 | B | 5 | 18 | - | - | - | finished all production turned to finishing herd resigned membership |
| Lin | 15 | A | 18 | 28a | - | - | - | |
| Mäk | 14 | A | 3 | 15a | - | - | - | |
| Tuo | 28 | B | 11 | 24 | 9/98 | 0 | 20 | |
| Pie | 48 | A | 4 | 30 | 12/98 | 0 | 20 | |
| Hei | 50 | A | 9 | 28a | 4/99 | 0 | 25 | |
| Rah | 46 | A | 25 | 30 | 4/99 | 0 | 30 | |
| Mie | 30 | A | 5 | 15 | 5/99 | 0 | 15 | |
| Mar | 25 | A | 8 | 10 | 5/99 | 0 | 20 | |
| Kär | 19 | A | 4 | 15 | 5/99 | 0 | 20 | |
| OjH | 30 | A | 11 | 20 | 6/99 | 0 | 10 | |
| OjR | 30 | A | 8 | 16 | 6/99 | n.a. | n.a. | n.a. = not analysed |
| Eur | 170 | A | 7 | 12a | 7/99 | 0 | 20 | |
| Ant | 35 | A | 13 | 18 | 8/99 | 0 | 11 | |
| Kej | 20 | A | 18 | 20 | 9/99 | 0 | 20 | |
| Par | 25 | A | 9 | 11a | 9/99 | 0 | 11 | |
| Vou | 38 | A | 8 | 21 | 9/99 | 0 | 15 | |
| Meh | 26 | A | 13 | 19 | 12/99 | 0 | 10 | |
| Oll | 10 | A | 6 | 15 | 12/99 | n.a. | n.a. | |
| Pak | 12 | A | 6 | 10a | 12/99 | 0 | 16 | |
| Ras | 60 | A | 5 | 23a | 12/99 | 0 | 11 | |
| Ten | 25 | A | 14 | 29a | 12/99 | 0 | 10 | |
| Tas | 20 | Ac | 8 | 15a | 9/00 | n.a. | n.a. | |
| Aht | - | Cc | 8 | 10a | 6/00 | - | - | |
| Tur | - | Cc | 7 | 7a | 7/00 | - | - | |
| Vit | - | Cc | 1 | 7a | 7/00 | - | - | |
| Kol | - | Cc | 9 | 15a | 11/00 | - | - | |
All sow herds were screened for M. hyopneumoniae antibodies during 1998 and 1999. In addition, a survey of all pig herds was done in March 2000 based on randomly collected blood samples (n = 509) from slaughtered finishing pigs. Simultaneously, all type C herds were screened.
A = farrowing-to-finishing herd; B = farrowing herd; C = finishing herd practising continuous flow system a Serum samples b Corresponding to antibodies to M. hyopneumoniae by ELISA. c Indication of infection was found only during the survey or the screening of type C herds.