Show simple item record

dc.creatorBeach, John Charlesen_US
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to, referencing the URI of the item.en_US
dc.descriptionIncludes bibliographical references (leaves 85-95).en_US
dc.descriptionIssued also on microfiche from Lange Micrographics.en_US
dc.description.abstractThis study evaluated the effect of typical production practices during transport of cattle on the resulting incidence of pathogenic bacteria in cattle and their resulting carcasses. Various factors, including type of animal, body condition score, breed, age, time of feed/water withdrawal, contamination level of transport vehicle at the feedlot/farm, transport time/distance, contamination level of the holding pen, and time held in holding pen, were evaluated for their effect on the incidence of Salmonella and Campylobacter in feedlot cattle and adult beef cattle. Four groups of feedlot cattle and four groups of adult cattle were sampled on different days. Samples were collected from the cattle both prior to transport and after transport (rectal and hide swabs) as well as from the carcasses derived from these cattle. Furthermore, environmental samples were collected from the transport vehicles, holding pens, and knock boxes at the slaughter facility. Following sample collection, microbiological examination was conducted to provide a characterization of the incidence of Salmonella and Campylobacter within the segment of the farm-to-table continuum in Texas related to the transport of cattle from feedlots/farms to the slaughter plants. The intestinal carriage rate of Salmonella for feedlot cattle decreased from 5.0% prior to transport to 3.0% after transport whereas the intestinal carriage rate for adult cattle increased from 1.0% prior to transport to 20.8% after transport. Although the adult cattle were shedding more Salmonella overall, hide contamination with Salmonella was very similar for both feedlot and adult cattle (an increase from approximately 19.0% prior to transport to 55.0% after transport). Carcass contamination with Salmonella was 19.0% for feedlot cattle and 54.2% for adult cattle. The intestinal carriage rate of Campylobacter for feedlot cattle increased from 64.0% prior to transport to 68.0% after transport whereas the intestinal carriage rate for adult cattle increased from 6.3% prior to transport to 7.3% after transport. Campylobacter contamination of hides and carcasses in both feedlot and adult cattle was minimal. Regression analysis indicated that there were no relationships between the aforementioned risk factors and subsequent fecal shedding, hide contamination, and carcass contamination.en_US
dc.publisherTexas A&M Universityen_US
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en_US
dc.subjectfood science and technology.en_US
dc.subjectMajor food science and technology.en_US
dc.titleRisk of Salmonella and Campylobacter contamination of cattle during transport to slaughteren_US
dc.typeThesisen_US science and technologyen_US
dc.format.digitalOriginreformatted digitalen_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.

Request Open Access