| Autor: |
K. Cookson, C.L. Hofacre, M. Da Costa, J.L. Schaeffer, M. Jones, J.A. Baxter, R. Berghaus, D. Cosby, M. Berrang, E.A. McMillan |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
|
| Zdroj: |
Journal of Applied Poultry Research, Vol 33, Iss 1, Pp 100382- (2024) |
| Druh dokumentu: |
article |
| ISSN: |
1056-6171 |
| DOI: |
10.1016/j.japr.2023.100382 |
| Popis: |
SUMMARY: Food safety is a major concern for consumers, regulators, and poultry producers. The top poultry relevant Salmonella serovars of most concern for human health and safety are S. enterica Enteritidis, Typhimurium, Heidelberg, and Infantis. An outbreak of poultry related salmonellosis has obvious public health implications but may also generate negative consumer impressions, significantly disrupt poultry production and reduce producer revenue. Vaccination of broilers against Salmonella is becoming accepted as an intervention to help producers provide a safe and wholesome product to consumers. We tested a live S. Typhimurium vaccine as a means to reduce broiler colonization, shedding, and carcass contamination. Two preliminary experiments were conducted in floor pens followed by a large-scale commercial field trial. In all experiments, vaccinated broilers received a live S. Typhimurium vaccine (Poulvac ST) at day of hatch (spray) followed by a booster vaccination in the second week. Control birds were treated with a sham vaccine. In the floor pen experiments, treated and control chicks were challenged with S. Heidelberg either by direct gavage or indirect exposure from gavage pen mate seeders or previously contaminated pine shaving litter. In the floor pen experiments, vaccinated birds were no less likely to be Salmonella positive but carried a significantly lower number of Salmonella cells in the ceca. No effect was noted on production parameters. In the field trial, treated and control birds were only exposed to the natural Salmonella challenge present in the 89 flocks enrolled in the study. Broilers were transported to a commercial slaughter/processing facility; carcass rinses were collected at hot rehang and tested for Salmonella. Significantly fewer carcass rinses were Salmonella positive among vaccinated flocks than unvaccinated flocks. Five serovars of Salmonella were detected from untreated broilers while only 2 (Kentucky and Muenster) were detected in vaccinated broilers. The vaccine provided significant protection without any negative effect on production parameters. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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