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首页> 外文期刊>American Journal of Veterinary Research >Behavioral and physiologie changes in Holstein steers experimentally infected with Mannheimia haemolytica
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Behavioral and physiologie changes in Holstein steers experimentally infected with Mannheimia haemolytica

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OBJECTIVETo evaluate changes in behavior and surfactant protein (SP) A and D concentrations in serum and bronchoalveolar lavage fluid (BALF) samples of calves experimentally infected with Mannheimia haemolytica.ANIMALSTwelve 4- to 5-month-old Holstein steers.PROCEDURESCalves were divided into 2 treatment groups and instrumented with a data logger to collect behavioral data. After IO days of acclimation, calves were experimentally inoculated with 3 X 1O~9 CFUs to 5 X 1O~9 CFUs of M haemolytica suspended in approximately 5 mL of PBS solution (infected calves; n = 6) or 5 mL of PBS solution without M haemolytica (control calves; 6) through a catheter into the right accessory lung lobe. Calves were clinically evaluated twice daily for 7 days after inoculation. Blood and BALF samples were collected from all calves at predetermined times for determination of serum and BALF SP-A and SP-D concentrations. Serum and BALF concentrations of SP-A and SP-D and behavioral data were evaluated over time and between treatment groups.RESULTSCompared with control calves, infected calves spent more time lying in general and more time lying on the right side during the 24 hours and 6 days after inoculation, respectively. Mean rectal temperature for infected calves (41.3°C) was significantly greater than that for control calves (39.2°C) 12 hours after inoculation. Mean respiratory rate for infected calves (52.5 breaths/min) was significantly greater than that for control calves (45.4 breaths/min) throughout the observation period.CONCLUSIONS AND CLINICAL RELEVANCEResults indicated continuous behavioral monitoring may improve detection of calves with respiratory tract disease.

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