Comparison of etiology of environmental mastitis in two herds of dairy cows
2007
Vasiľ, M., University of Veterinary Medicine, Košice (Slovak Republic)
The aim of our work was to compare the incidence, aetiology and course of environmental mastitis in two herds of dairy cows with different technology of housing and milking. Observations were performed during 2005-2006 quarterly, using methods of clinical examination of the dairy cow udder, and milk cytological and bacteriological examinations. In both herds, the anti-mastitis measures were taken at the beginning of observation. In the herd with free housing of 112 dairy cows in full lactation, Staphylococcm aureus participated least in the intra-mammary infections from August 2005 to December 2006 (0.0%-5.2%), and Streptococcus agalactiae occurred only once (May 2006) in 2 dairy cows. There were more coagulase-negative staphylococci (1.8%-36.1%), and Streptococcus uberis occurred in the range from 29.1% to 2.8%. The course of intra-mammary infections was latent and sub-clinical. Anti-mastitis measures were efficient and ensured that in the second half of observation 2/3rd of dairy cows had SCC less than 250,000 per ml of milk. In the herd with stanchion housing of about 59 dairy cows in full lactation, Staphylococcus aureus participated the least (0.0-6.6%) in the intra-mammary infections from August 2005 to July 2006, and coagulase-negative staphylococci were represented more (from 16.1% to 2.2%), but Streptococcus uberis (0.0-18%) had the highest count. Intra-mammary infections ran, above all, sub-clinically and latently, but later the occurrence of sub-acute and chronic mastitis increased. The introduced anti-mastitis measures were efficient - the number of dairy cows with SCC less than 250,000 per ml of milk increased from original 27.9% to 80.4% of dairy cows at the end of observation
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