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e-ISSN 1828-1427

  

Rivista trimestrale di Sanità Pubblica Veterinaria edita dall'Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise ‘G. Caporale’

A quarterly journal devoted to veterinary public health, veterinary science and medicine published by the Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise ‘G. Caporale’ in Teramo, Italy

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2004 - Volume 40 (4), October-December
   
 
F. Monaco, N. De Luca, D. Morelli, M. Pisciella, S. Palmarini, M. Di Giandomenico & G. Savini
Field vaccination of cattle using a bivalent modified-live vaccine against bluetongue virus serotypes 2 and 9: effect on milk production 661-663
       

Summary
To evaluate the effect of bluetongue (BT) vaccination on milk production in cattle, 30 cows at various stages of gestation were vaccinated using a bivalent bluetongue virus serotype 2 (BTV-2) and BTV-9 modified-live vaccine produced by Onderstepoort Biological Products in South Africa. A second group of 30 pregnant cows was used unvaccinated controls. Blood samples were taken from all animals three times a week for two months. Virus titres were determined and the daily milk production of each cow was quantitatively and qualitatively evaluated. From 27 of the 30 vaccinated cows, BTV was isolated from day 4 to day 28 post vaccination. BTV vaccination had no effect on milk production, somatic cell count, pH, milk fat, protein and lactose content. It is concluded that the bivalent BTV-2/BTV-9 modified-live vaccine does not affect milk production in cows.

Keywords
Bluetongue, Cattle, Lactose, Milk fat, Milk pH, Milk protein, Milk production, Somatic cell count, Vaccine, Viraemia, Virus.


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