Immunity in heifers 12 months after vaccination with a multivalent vaccine containing a United States Leptospira borgpetersenii serovar Hardjo isolate.

Objective: To evaluate immunity induced by a multivalent vaccine containing a US Leptospira borgpetersenii serovar Hardjo type hardjo bovis (LHB) isolate in heifers challenged 12 months after vaccination.

Design: Prospective vaccine challenge study.

Animals: 36 one-month old Holstein heifers.

Prevalence of and risk factors for paratuberculosis in purebred beef cattle.

Objective: To estimate the prevalence of paratuberculosis in purebred beef cattle in Texas and identify risk factors for seropositivity.

Design: Epidemiologic survey.

Animals: 4,579 purebred cattle from 115 beef ranches in Texas.

Repetitive propofol administration in dogs and cats.

A bolus of propofol was administered to 10 dogs (6 mg/kg intravenously [IV]) and 10 cats (10 mg/kg IV) on three consecutive days. The occurrence of apnea, heart and respiratory rates, blood pressure, time to movement, and changes in a complete blood count and biochemical profile were recorded. Apnea was not seen in the dogs but was seen in three cats.

Evaluation of an inactivated Neospora caninum vaccine in beef feedlot steers.

Objective: To evaluate effects of vaccination of feedlot steers against bovine neosporosis on weight gain, feed intake and efficiency (feed intake per gain), and carcass characteristics.

Design: Longitudinal observational study.

Animals: 60 weaned Brangus steers seronegative for Neospora caninum.