Streptococcus suis in Swedish grower pigs: occurrence, serotypes, and antimicrobial susceptibility

Table 2 Production data from 20 Swedish pig herds with (case herds) and without (control herds) a history of Streptococcus suis-infections in grower pigs

Production parameters	Sweden 2017^a	Control herds			Case herds			P value
Production parameters	Mean	n	Mean	SD	n	Mean	SD
Sows in production^b	354	9	223.1	178.8	7	424.3	345.9	0.15
Sows farrowing per batch	n/a	10	28.7	14.2	10	39.3	14.8	0.12
Litters/sow/year^b	2.24	6	2.12	0.27	6	2.20	0.06	0.49
Piglets born alive/litter	14.3	7	14.0	0.9	8	14.5	0.7	0.34
Pigs weaned/litter^c	11.9	7	11.3	1.1	8	11.9	0.7	0.22
Pigs weaned/sow/year^b	26.6	6	24.0	4.6	6	26.6	1.4	0.24
Age at weaning (days)	32.8	10	36.0	4.2	10	33.2	3.3	0.11
Gilt recruitment (%)	24.8	9	25.7	9.5	8	29.0	5.5	0.40
Farrowing interval (weeks)	n/a	10	3.4	1.7	10	2.5	1.1	0.18

All data parameters were not available for all herds (n = number of herds included)
^aMean values for Sweden according to the InterPIG report 2018 [49]
^bSow pools not included
^cNurse sows were used in one of the control herds and six of the case herds

ISSN: 1751-0147