| dc.description.abstract | Calf mortality among crossbred cattle is a major problem in dairy farms of Bangladesh.
Indiscriminate use of antibiotics to control the diseases results drug resistance and limits the
therapeutic possibilities in the treatment of the diseases. This research work was conducted to
Isolate & identify the bacterial pathogens causing calf mortality. The study was conducted on
121 samples collected from the sick & dead calves, during the period of July, 2014 to
December, 2014 brought for the treatment to the Sadar Upazilla veterinary hospital, Dinajpur
& 08 different dairy farms under Dinajpur District to find out the occurrence of pathogenic
bacteria. Out of 121 samples exmined for bacterial isolates, the number and frequency of
distribution in percentage for positive samples were 69 (57.02%) for E. coli, 28 (23.14%) for
Salmonella spp., 16 (13.22%) for Pasteurella spp. and 28(23.14%) was negative for bacteria
(Nutritional and other than bacterial causes involved). Isolation and identification of the
microorganisms were confirmed on the basis of their morphology, staining, cultural &
biochemical properties. Antibiotic sensitivity of the isolated organisms were also studied. The
antibacterial sensitivity study revealed that these 03 isolates were highly sensitive to
Ciprofloxacin, Gentamicin, Erythromycin & Enrofloxacin; moderately sensitive to
Erythromycin, Enrofloxacin, Amoxycillin, Doxycycline, Oxytetracycline &
Chloramphenicol; Less sensitive to Amoxycillin, Doxycycline, Oxytetracycline,
Chloramphenicol, Ampicillin & Streptomycin and resistant to Amoxycillin, Ampicillin,
Doxycycline & Streptomycin. The findinings of the experiment indicates that the use of
Ciprofloxacin, Gentamicin, Erythromycin & Enrofloxacin, may have the preference to be
choice in clinical control of Salmonella, E. coli & Pasteurella causing calf mortality in
crossbed cattle in Bangladesh. | en_US |
