Preweaned heifer management on US dairy operations: Part IV. Factors associated with the presence of Escherichia coli O157 in preweaned dairy heifers
| Autor: | Roberta J. Magnuson, Jason E. Lombard, Craig S. McConnel, C. Stenkamp-Strahm, Sheryl Magzamen, N.J. Urie, C.B. Shivley, Lyndsey M. Linke |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
030106 microbiology Cattle Diseases Weaning Escherichia coli O157 medicine.disease_cause Feces 03 medical and health sciences fluids and secretions Animal science Pregnancy Pathogenic Escherichia coli Genetics medicine Animals Lactation Escherichia coli Escherichia coli Infections Animal health biology Colostrum Monitoring system Animal husbandry biology.organism_classification Animals Suckling 030104 developmental biology Animals Newborn Cattle Female Animal Science and Zoology Food Science |
| Zdroj: | Journal of Dairy Science. 101:9214-9228 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.2018-14659 |
| Popis: | Dairy calves shed pathogenic Escherichia coli O157 (O157) in feces and are a potential route of exposure for human infections. As part of the National Animal Health Monitoring System's (NAHMS) Dairy 2014 study, we evaluated farm, animal, and environmental factors associated with O157 presence in dairy heifer calves. For this O157 study, calves were enrolled from 100 dairy operations in 13 states. Each operation collected data from calves from birth to weaning over an 18-mo period. A single fecal sample was collected from 487 calves in western states and from 871 calves in eastern states (n = 1,358 total), and O157 was detected in 2.5% (n = 34) of fecal samples. Descriptive statistics and univariable screening were used to determine which farm practices, environmental factors, and calf health measures were associated with O157 detection. Multilevel logistic models, controlling for dairy operation, were created using backward elimination of screened variables. The final O157 main effects model included variables for source of colostrum, temperature-humidity index (THI), and serum IgG concentration. Higher serum IgG was associated with lower odds of O157 shedding, whereas calves fed colostrum from their own dam had higher odds of O157 shedding than calves fed colostrum from pooled sources. Interaction models showed that THI level modified the effect of colostrum source on O157 shedding; calves with a THI indicative of heat stress had a significantly increased presence of O157 when fed colostrum from a first-lactation dam. The THI level also modified the effects of serum IgG. Calves with thermoneutral or heat stress THI values had increased presence of O157 with poor ( |
| Databáze: | OpenAIRE |
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