Evaluation of cleaning and disinfection procedures against Samonella enterica at swine farms, transport and lairage facilities

Abstract

Evaluation of the cleaning and disinfection protocols effectiveness against Salmonella in three points of the pork production chain: finishing farm, transport and lairage. A 22.2% of the farms, 62.5% of the slaughter trucks and 63.6% of the holding pens tested were positive to Salmonella after cleaning and disinfection procedures. The other samples collected in trucks and lairage shows that there is also contamination before the pigs staying. These results show that the protocols carried out at the farms, trucks and abattoirs included in this survey are not efficient to eliminate Salmonella.

Role of Slaughtering in Salmonella Spreading and Control in Pork Production

“…However, in some studies no differences in Salmonella shedding have been found between short or large hauls (77). However, an increase in Salmonella prevalence after transport has been detected in several studies (8,55,63,77). Because of this increase in shedding, which seems to be promoted by several factors, high levels of Salmonella can be found in trucks and bedding material after transport.…”

“…In most industrialized countries, washing and disinfec tion of slaughter trucks before they leave the abattoir is mandatory; nevertheless, Salmonella is frequently found in slaughter trucks after transport (8,63,77,88), and several authors have reported high percentages of Salmonellapositive samples after truck washing (8,63), which shows the inefficiency of the current washing protocols. Analyses of preloading samples from transport vehicles indicate that transport is also a source of infection for Salmonella-free pigs.…”

Salmonella Control Measures at Farm in Swine Production

“…Regarding useful disinfectants, it can be said that Salmonella is susceptible to most of the disinfectants used, such chlorine, iodine derivates, phenols, peroxides or quaternary ammonium compounds. However it is surprising that being susceptible to most disinfectants it can be found after cleaning and disinfection protocols routinely applied at farm level (Argüello et al, 2011b).…”

“…We have evaluated the effectiveness of routinely cleaning and disinfection procedures against Salmonella in swine farms (Argüello et al, 2011). A total number of thirty-six pig finishing farms performing a strict all-in/all-out management (AI/AO) were studied by collecting twelve samples within each farm including samples from pen floors (5 samples), pen walls (5 samples), corridors (1 sample) and dust (1 sample).…”

“…Our research group carried out an interventional study in a pig fattening unit infected by Salmonella to assess the effectiveness of an acid treatment administered in drinking water for the control of salmonellosis (Argüello et al, 2011b). Animals from the experimental group were administered a commercial acid, composed of lactic acid (56%), formic acid (23%), propionic acid (13%) and acetic acid (5%), that was added to drinking water during the last 40 days of the fattening period at a concentration of 0.035%.…”