Oil Red O-positive lipid in peritoneal fluid from a horse with a rectal tear.

A 4-year-old Quarter Horse mare was presented to the Texas A&M University Veterinary Medical Teaching Hospital for evaluation of a rectal tear. On initial evaluation, rectal palpation and colonoscopy revealed a grade IIIb rectal tear. Analysis of peritoneal fluid revealed a modified transudate.

Evaluation of a model for Escherichia coli O157:H7 colonization in streptomycin-treated adult cattle.

Objective: To develop a repeatable model for studying colonization with streptomycin-resistant Escherichia coli O157:H7 in adult cattle.

Animals: 5 adult mixed-breed beef cattle.

Procedures: Cattle were surgically cannulated in the duodenum, treated daily with streptomycin (33 mg/kg) via the duodenal cannula prior to and during experimental colonizations, and colonized with 10(10) CFUs of streptomycin-resistant E coli O157:H7 via the duodenal cannula.