Aujeszky’s disease and the effects of infection on Japanese swine herd productivity: a cross-sectional study

Abstract

Pseudorabies virus (PRV) is endemic in some regions of Japan. We investigated the effects of PRV infection status on herd productivity. Serum samples were obtained from 48 swine herds in Japan. Within each herd, three serum samples were obtained from growing pigs at four different ages, as well as from sows in low and high parity groups. Sera were tested for antibodies against wild-type PRV via competitive ELISA. Herds were classified into PRV positive and negative groups based on serological results. Herds infected with PRV exhibited postweaning mortalities (6.84%) that were significantly (P=0.0018) higher than those in unaffected herds (4.73%). Because of the reduced productivity in PRV positive herds, the current PRV eradication program must be strengthened.

Impact of a porcine epidemic diarrhea outbreak on swine productivity in Japan: a retrospective cohort study

“…Production parameters : The herd-level production data were obtained every 3 months from the PigINFO system [ 17 ]. For each herd, the numbers of sows and mated gilts were counted at the end of each month, and the average female inventory (AFI) for each herd was defined as the average number of sows and mated gilts in 2014.…”

“…For each herd, the numbers of sows and mated gilts were counted at the end of each month, and the average female inventory (AFI) for each herd was defined as the average number of sows and mated gilts in 2014. The herd-level productivity data, such as preweaning mortality (%; PRWM), postweaning mortality (%; POWM), pigs weaned per litter (PWL), pigs born alive per litter (PBA), litters per mated female (LMFY) and numbers of marketed pigs (/sow/year; MP), were calculated based on the definitions as described previously [ 17 ]. To calculate MP, the data obtained from each 3-month period were converted to 1-year data by multiplying them by 4.…”

“…The objective of this study was to summarize the characteristics of the PED infections in the second epidemic in Japan using data from herds belonging to the clients of consulting veterinarians. We also investigated the effects of the herd-level PED status on productivity using a data recording system (PigINFO) recently developed for Japanese swine producers [ 17 ].…”

Assessment of listing and categorisation of animal diseases within the framework of the Animal Health Law (Regulation (EU) No 2016/429): Aujeszky's disease

“…A more recent Japanese study investigating the effect of ADV infection on productivity in farrow‐to‐finish herds, found a significant higher post‐weaning mortality in ADV‐positive herds (6.84%, 2.29 SD) compared to negative herds (4.73%, 1.78 SD) and lower marketed pigs per sow (20.1, 2.06 SD), litters per mated females per year (2.28, 0.15 SD) and farrowing proportion (80.7%, 6.39 SD) than negative herds (21.7, 2.69 SD; 2.35, 0.12 SD; 85.1%, 7.40 SD, respectively) (Yamane et al., ). As targeted herds volunteered to be part of this study, the authors specified that this selection bias could have resulted in the inclusion of herds with higher levels of animal hygiene and those with motivated owners.…”

Transcriptome analysis of Pseudorabies virus reveals selective regulation of different kinetic classes of genes

“…Although, PRV was officially eradicated from the United States (Anderson et al 2008) and most European countries, there are still reports of outbreaks in China (Wang et al 2015) (See Figure 2 for outbreaks in China in 2013), and the virus is also present in other areas world in either domestic swine or wild boars (Yamane et al 2015;Verin et al 2014;Verpoest et al 2014). PRV is also able to infect a broad range of hosts outside the Suidae family including sheep, cats, dogs, rabbits, guinea pigs and more (Woźniakowski & Samorek-Salamonowicz 2015).…”