Oral and Poster Abstracts

1
Oregon State University, College of Veterinary Medicine, Corvallis,
United States
2
USDA-APHIS-VS-CEAH, Fort Collins, United States
3
Colorado State University, Animal Population and Health Institute,
Fort Collins, United States
4
USDA-ARS, Athens, United States
Objective of study: The objective of this study was to describe
antimicrobial resistance patterns of Salmonella spp. and non-type
specific Escherichia coli isolated from the same animals and same
environmental areas over time.
Materials and Methods: Sampling occurred at a local dairy over a 12
month period, at 8 week intervals. Samples were collected from animal
feces (cows and calves), feed, drinking water, hospital milk, colostrum
and alleyway flush water.
Results: Salmonella serotypes recovered from environmental and fecal
samples collected from the same groups of animals differed.
Salmonella serotypes were different between calves and cows. In
addition, antimicrobial resistance patterns of both Salmonella and E.
coli were different.
Conclusions: Based on our data, we conclude that under field
conditions Salmonella and E. coli may not exchange genetic material as
readily as previously suggested. These results may be partially due to
effective biosecurity procedures on this particular dairy, avoiding
cross-contamination between cow and calf-areas.
Key words: antimicrobial resistance, dairy cattle
278 Subconjunctival (SC) Injection of Penicillin-Streptomycin in
Keratoconjunctivitis of Calves and Adult Cattle - an Efficient,
Economic Approach
E. Bani Hassan 1 , T. Taghipour Bazargani 1 , R. Rahchamani 1 ,
H. Sharifi 2 , A. Hosseinzadeh 3 , I. Ashrafi Tamay 1 , Sh. Moaddab 1 ,
E. Torki 1
1
Faculty of Veterinary Medicine, University of Tehran, Department
of Clinical Science, Tehran, Iran
2
Faculty of Veterinary Medicine, University of Tehran, Department
of Food Hygiene, Tehran, Iran
3
Urmia University, Department of Veterinary Microbiology, Urmia,
Iran
Objectives: To determine the efficacy of IC-therapy and comparing
this method to other common therapies.
Materials and methods: The study was carried out as a pilot in two
dairy farms and after approval of the efficacy of subconjunctival
therapy we used this method to as the routine treatment for
conjunctivitis and keratoconjunctivitis. At the first stage we showed
that the single SC injection of penicillin-streptomycin, showed
completely superior results compared to other methods including
systemic antibiotic therapies with oxitetracycline, oxitetracycline plus
tylosine, florefenicole, and even systemic injection of penicillinstreptomycin
(p=0.0001).In the next step we choose the method as the
usual treatment for the disease in both calves and adult cattle. This
resulted in deletion of the problem of blindness and growth retardation
due to keratoconjunctivitis (P