Impact of Commercial Pre-Harvest Processes on the Prevalenceof Salmonella enterica in Cull Sows

Jd, McKean; Hs, Hurd; Larsen, S. T.; Rostagno, Marcos H.; Griffith, Ronald W.; Wesley, Irene V.

doi:10.31274/safepork-180809-239

Cited by 11 publications

(13 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mean number of serovars isolated per batch also increased between the farm and the slaughterhouse. These phenomena have been previously reported by Hurd et al [15,16] and McKean et al [21], who hypothesised cross-contamination in lairage.…”

Section: Discussionsupporting

confidence: 80%

“…Therefore, carcass surface contamination is likely to reflect the hygienic quality of in-plant practices and may not be a useful measure of pre-slaughter prevalence [38]. Gut-associated lymph nodes have been shown to be less sensitive samples than caecal contents in several studies [21,24]. In a previous study performed on 160 pigs at the slaughterhouse, 25% of the pigs carried Salmonella (40/160) in the ileocaecal lymph nodes, whereas 40% (63/ 160) of the same pigs harboured the bacteria in the caecal contents [3].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

et al. 2004

View full text Add to dashboard Cite

-The aim of this study was to evaluate the impact of the pre-slaughter process on Salmonella caecal contamination of pigs at slaughter. An observational study was carried out in 2001 on 101 conventional farrow-to-finish pig farms. On each farm, one batch of contemporary pigs was followed from the end of the fattening period until slaughter. The Salmonella bacteriological status of the batches was assessed by environmental samples of faecal material. The serological Salmonella status was obtained on 30 individually identified market-age pigs using an indirect ELISA test. At the slaughterhouse, 25 g of caecal contents were taken from 10 of the identified pigs. Faecal and caecal material were analysed according to a classical bacteriological method. A questionnaire was designed to obtain information about the type of feeding during the fattening period (dry versus wet), the duration of fasting on the farm before leaving for the slaughterhouse, the duration of transport between the farm and the slaughterhouse, the holding time in lairage at the slaughterhouse and loading and unloading conditions on the farm and at the slaughterhouse. To assess the relationships between these factors and the Salmonella caecal status of the pigs and the batches, two logistic models were fitted at the individual and at the batch level, respectively. The first analysis was performed using a random effects logistic regression model. The second analysis was based on a cumulative logit model with a positive caecal rate classified into three classes as the outcome variable. The results showed that the Salmonella status of market-age pigs assessed on the farm either by serological or bacteriological examinations and the time spent in lairage before slaughtering played a crucial role on caecal contamination. In the light of these results, actions should be considered both on the farm and at the slaughterhouse to decrease the risk of Salmonella contamination of the caecal contents.

show abstract

Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

et al. 2004

View full text Add to dashboard Cite

show abstract

“…Culled sows generally leave for slaughtering shortly after weaning and thus are at a moment of high risk for Salmonella shedding, as seen in the present results. During transport to the slaughterhouse, stress can even increase the number of Salmonella shedding animals [6,20]. If these sows are slaughtered, the risk for contamination of the carcasses may not be neglected.…”

Section: Discussionmentioning

confidence: 99%

Salmonella in sows: a longitudinal study in farrow-to-finish pig herds

et al. 2005

View full text Add to dashboard Cite

-Besides finishing pigs, sows are also believed to be important in the epidemiology of Salmonella. The study objective was to investigate the prevalence of Salmonella excretion in sows during an entire reproductive cycle. In 3 farrow-to-finish herds, groups of 34, 40 and 32 sows, respectively, were sampled serially. Faecal samples, environmental swabs and feed samples were taken and submitted to a qualitative Salmonella isolation. All isolates were characterised using RAPD and a representative number of isolates was serotyped. The prevalence of Salmonella excretion was < 10% during gestation, around farrowing and during lactation, but a significant increase in the number of Salmonella excreting sows was found in herds A (p < 0.01) and C (p = 0.02) after weaning. S. Infantis was the most prevalent serotype in herd A, S. Derby in herds B and C. Except for the S. Infantis group in herd A, all isolates within each group of the RAPD analysis belonged to the same serotype. Three sows in herd A and 1 sow in herd C shed different serotypes at different time points. The present results indicate that sows can maintain Salmonella infections in farrow-to-finish herds and that culled sows, leaving the herd after weaning, may constitute a substantial risk for contamination of their carcasses with Salmonella.

show abstract

“…In the United States, between 1 and 6% of farm animals test positive for intestinal carriage of Salmonella serotypes (6-11, 27, 37). Stress during transport and long periods with intermittent feeding increase the spread of Salmonella among livestock and domestic fowl prior to slaughter (5,7,13,18,19,27,29,31,32). As a result, Salmonella serotypes can on average be isolated from Ͼ10% of apparently healthy animals prior to slaughter (7,27,37).…”

mentioning

confidence: 99%

“…Stress during transport and long periods with intermittent feeding increase the spread of Salmonella among livestock and domestic fowl prior to slaughter (5,7,13,18,19,27,29,31,32). As a result, Salmonella serotypes can on average be isolated from Ͼ10% of apparently healthy animals prior to slaughter (7,27,37). Intestinal carriage or chronic infection of mesenteric lymph nodes may result in contamination of equipment surfaces or workers' hands at processing plants, leading to contamination of carcasses and processed foods (14,29,31,32).…”

mentioning

confidence: 99%

Fibronectin Binding to the Salmonella enterica Serotype Typhimurium ShdA Autotransporter Protein Is Inhibited by a Monoclonal Antibody Recognizing the A3 Repeat

et al. 2004

View full text Add to dashboard Cite

ShdA is a large outer membrane protein of the autotransporter family whose passenger domain binds the extracellular matrix proteins fibronectin and collagen I, possibly by mimicking the host ligand heparin. The ShdA passenger domain consists of ϳ1,500 amino acid residues that can be divided into two regions based on features of the primary amino acid sequence: an N-terminal nonrepeat region followed by a repeat region composed of two types of imperfect direct amino acid repeats, called type A and type B. The repeat region bound bovine fibronectin with an affinity similar to that for the complete ShdA passenger domain, while the nonrepeat region exhibited comparatively low fibronectin-binding activity. A number of fusion proteins containing truncated fragments of the repeat region did not bind bovine fibronectin. However, binding of the passenger domain to fibronectin was inhibited in the presence of immune serum raised to one truncated fragment of the repeat region that contained repeats A2, B8, A3, and B9. Furthermore, a monoclonal antibody that specifically recognized an epitope in a recombinant protein containing the A3 repeat inhibited binding of ShdA to fibronectin.

show abstract

Impact of Commercial Pre-Harvest Processes on the Prevalenceof Salmonella enterica in Cull Sows

Cited by 11 publications

References 0 publications

Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

Impact of the Salmonella status of market-age pigs and the pre-slaughter process on Salmonella caecal contamination at slaughter

Salmonella in sows: a longitudinal study in farrow-to-finish pig herds

Fibronectin Binding to the Salmonella enterica Serotype Typhimurium ShdA Autotransporter Protein Is Inhibited by a Monoclonal Antibody Recognizing the A3 Repeat

Contact Info

Product

Resources

About