engleski

Učinak Startvac ® cjepiva na kontrolu kliničkog ili subkliničkog mastitisa i broja somatskih stanica u istočnoj Hrvatskoj

The aim of the study was to evaluate the usefulness Startvac® vaccine in controlling and reducing the incidence of clinical and sub-clinical mastitis and its effect on the somatic cells count in bulk tank milk. The research was conducted with app. 220-250 Holstein cows and app. 90 heifers. The quarter milk samples were take n before vaccination programme twice from cows with positive Zagreb mastitis reagent and high somatic cell count. After obtaining Staph. aureus positive bacteriological results, the cows with 3 or all 4 positive quarters were culled (n=4). The vaccination program started on 21/08/2012 with a 3-week interval between the first and the second injection (n=312, cows and pregnant heifers) and thereafter the booster injections were administered every 3 months. The data from the vaccination program (August 2012 to December 2013) was evaluated as results from January 2011. After the first and the second injection, the incidence of clinical mastitis decreased on this farm from the average value of 5.34% (n=234) in 2011, and 4.79% (n=238) in 2012 to 0.85% (n=221) in 2013. The average somatic cells counts were 601 900 (2011), 567 200 (2012) and 177 500 somatic cells/mL of bulk tank milk (2013). The average number of clinical mastitis assessed monthly was 12.5 in the first year of study, 11.4 in the next year and 1.6 in the last year. I may be concluded that Startvac® vaccine was efficacious in controlling subclinical and clinical mastitis infections caused by S. aureus and coliform bacteria. The vaccinations seemed to have no effect on decreasing the incidence of other infections such as streptococci, Bacillus sp., Pseudomonas sp., yeasts and others. The vaccinations were efficacious in decreasing the bulk tank milk somatic cells count after the third dose to an acceptable number below 400 000 somatic cells per ml of milk.

Startvac; cijepljenje; mastitis; krava

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