Effect of antemortem feeding regimes on bacterial numbers in the stomachs and ceca of pigs

Citation
Fm. Nattress et Ac. Murray, Effect of antemortem feeding regimes on bacterial numbers in the stomachs and ceca of pigs, J FOOD PROT, 63(9), 2000, pp. 1253-1257
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Food Science/Nutrition
Journal title
JOURNAL OF FOOD PROTECTION
ISSN journal
0362-028X → ACNP
Volume
63
Issue
9
Year of publication
2000
Pages
1253 - 1257
Database
ISI
SICI code
0362-028X(200009)63:9<1253:EOAFRO>2.0.ZU;2-E
Abstract
Three groups, each of 45 pigs, were either not fasted, fasted for 15 h duri ng lairage at the abattoir, or fasted for 15 h before dispatch from the pig gery to the abattoir. Three subgroups, each of 15 pigs from each group, wer e held at the abattoir for additional times of either 0 to 1 h, 2 to 3 h, o r 4 to 5 h. Immediately after slaughter, stomach and cecal contents were co llected for pH measurement and enumeration of coliforms, Escherichia coli b iotype 1 and lactic acid bacteria (LAB). Stomach pH changed from 4.1 to 3.1 as additional abattoir holding time increased from 0 to 1 h to 4 to 5 h bu t was unaffected by feed withdrawal (mean pH, 3.5). Cecal pH (range 6.4 to 7.2) increased in response to both treatments. Coliform and E. coli biotype 1 numbers in the stomach, means 4.6 and 4.5 log CFU/g, respectively, were not affected by feed withdrawal but decreased 0.8 log units as additional a battoir holding time increased from 0 to 1 to 4 to 5 h. LAB in the stomach decreased in response to both feed withdrawal and holding at the abattoir. Cecal numbers of coliforms and E. coli biotype 1 increased 0.8 and 1.0 log units to 7.8 and 7.6 log CFU/g, respectively, as a result of feed withdrawa l, and 0.6 log units to 7.6 and 7.5 log CFU/g, respectively, as additional abattoir holding time increased to 4 to 5 h. The LAB in the cecum (mean 9.4 log CFU/g) increased slightly with increasing abattoir holding time. In th e event of release of stomach or cecal contents onto the meat during carcas s dressing, larger numbers of E. coli per g would be released from the ceca and fewer per g from the stomachs of pigs that have had feed withdrawn as compared to pigs not subjected to feed withdrawal.