Risk factors associated with swine dysentery in East-European pig production units

C.P. Mirko, G. Bilkei
2005 Veterinarski Glasnik  
The objective of the present study was to determine the risk factors for swine dysentery in East-European middle-size to large farrow to finish units, with separate breeding and grower-finisher facilities. Ten breeding animals (3-10% of the female inventory) and 10 grower finisher pigs (80-140 days of age) were sampled in each herd for polymerase chain reaction testing (PCR) for Brachyspira hyodysenteriae (B hyo) in their feces. Of 139 farrow to finish units, 51 (36.7%) were positive, 49
more » ... positive, 49 (35.3%) were negative, and 39 (28.1%) were inconclusive for B hyo by PCR. In breeding subunits, twelve variables passed the screening criterion for risk factors (P<.2) for B hyo PCR positivity. The odds of the breeding subunits being B hyo PCR positive were 3.5 times greater when the grower-finisher subunit was positive and the fiber content of the diet was >6%. Use of "all in all out" farrowing policy and having >60% multiparous sows, each reduced the odds of being B hyo PCR positive about fourfold. In growing-finishing subunits, fourteen variables passed the screening criterion for risk factors (P<.2) for B hyo PCR positivity. B hyo PCR positive status of the breeding subunits and higher fiber content of the diet were the most influential variable, with the odds of the grower-finisher subunits being B hyo PCR positive almost eight times greater when the breeding subunit was also B hyo PCR positive. Grower-finisher B hyo PCR positivity was also associated with the percentage of pigs housed on concrete slats, with the odds of being positive 7.5 times higher for subunits where more that 70% of the animals were kept on concrete slats compared to all other floor types. There was a strong association between grower-finisher status and whether 349 ORIGINALAN NAU^NI RAD -ORIGINAL SCIENTIFIC PAPER * Rad primljen za {tampu 17. 1. 2005. godine ** Mirko CP, Bilkei G, Artgerechte Tierhaltung, Dübendorf, Switzerland the animals were in outdoor lots, with the odds of being B hyo PCR positive substantially lower for pigs in outdoor lots compared with all other surfaces.
doi:10.2298/vetgl0504349m fatcat:t767lpa5lffpbkbgpim73f2un4