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, bile ducts, and caudal vena cava. A percutaneous liver biopsy was performed with samples submitted for both bacterial culture and sensitivity and histopathology. Blood was also submitted for bovine leukemia virus (BLV) serology due to the atypical cells

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in Journal of the American Veterinary Medical Association

LPS. 16,17,20 The bovine mammary gland is highly susceptible to low doses of LPS. 21,22 Injection of LPS into the mammary glands of healthy cows induces mastitis, 21,23,24 and LPS is detectable in the milk of cows with coliform mastitis. 25

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in American Journal of Veterinary Research

. H&E stain, bar = 50 μm. Bacterial aerobic culture performed on fresh samples from the liver, lung, and spleen did not yield any growth. Ancillary testing for Bovine viral diarrhea virus, bovine herpesvirus-1, bovine respiratory syncytial virus

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in Journal of the American Veterinary Medical Association

- 901 . doi: 10.1177/1040638718808567 4. Okafor CC , Uzal FA , Culligan CM , Newkirk KM . Prevalence of cardiac lesions in cases of bovine blackleg in Tennessee (USA), 2004-2018 . Vet Sci . 2023 ; 10 ( 4 ): 297 . doi: 10.3390/vetsci

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in Journal of the American Veterinary Medical Association

.89 ± 15.45 kg) were identified at the Prairie Research Facility in Prairie, Miss. After selection, steers were vaccinated against Mannheimia haemolytica , parainfluenza virus, bovine respiratory syncytial virus, and bovine viral diarrhea virus. At weaning

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in American Journal of Veterinary Research

Abstract

Objective

To determine if transmission of virus among seropositive cattle is a plausible mechanism for the permanent presence of bovine respiratory syncytial virus (BRSV) in dairy herds, and how likely, with that scenario for persistence, there will be only 1 clinical outbreak of BRSV per year.

Design

Build a stochastic model, parameter estimation from serologic data on BRSV, and interpret the estimated parameter values from the model analysis.

Sample Population

Monthly data on the prevalence of antibodies directed against BRSV in sera from all cattle in 6 dairy herds.

Procedure

Parameter estimation applying general linear models, model analysis using calculation of the reproduction ratio for simplified models, and Monte-Carlo simulation for the whole model.

Results

Persistence of BRSV by transmission among seropositive cattle given estimated parameter values would be accompanied by frequent extinctions (once every 1 to 50 years) and long infectious periods in seropositive cattle (100 days). Moreover, in the model, a single clinical outbreak among seronegative cattle only occurred with external forcing.

Conclusions

From these data, transmission among seropositive cattle is not a plausible mechanism for persistence of BRSV in dairy herds. (Am J Vet Res 1996; 57:628–633)

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in American Journal of Veterinary Research
in Journal of the American Veterinary Medical Association
in Journal of the American Veterinary Medical Association

-kill kinetics against bovine mastitis pathogens such as Streptococcus agalactiae SCM1084 and Streptococcus uberis SCM1310. The bacteria were screened at the Large Animal Hospital and Students Training Center (Nakornpathom), Faculty of Veterinary Science

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in American Journal of Veterinary Research

evaluated again and was 1,800 mg/dL. Immediately after the last examination of the cria, blood samples from the cria, its dam, and 15 other alpacas in the herd were collected and submitted to the diagnostic laboratory for virus isolation. Bovine viral

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in Journal of the American Veterinary Medical Association