engleski

Etiologija i prevalencija intramamarnih infekcija mliječnih krava prilikom zasušenja

The aim of this research was to determine etiology and prevalence of udder infection in dairy cows before drying off on dairy farms in Croatia. A research was carried out on 6 dairy farms in Croatia. Milk samples were taken into sterile plastic tubes during the last milking prior to drying off. Bacteriology examination of milk samples had obtained 54 positive samples ; prevalence of intramammary infection (IMI) was 22.5%. The most common pathogens of IMI prior to drying off were Streptococcus spp. Lancefield group D (7.79%) and Staphylococcus aureus (6.56%). Other pathogens were coagulase-negative staphylococci (2.87%), Pseudomonas spp. (2.46%), Streptococcus agalactiae (2.05%), and other microorganisms (1.23%). In this research higher IMI prevalence in rear quarters (P= 0.03) in comparison to front quarters was observed. There were no significant differences in infection prevalence (P=0.07) comparing right to left quarters. Significantly higher prevalence of infection caused by Streptococcus spp. Lancefield group D (P=0.04) and environmental pathogens (P=0.02) were noted in rear quarters. These results have approved that environmental microorganisms were the most common pathogens of IMI prior to drying off in dairy cows in Croatia.

cow; mastitis; intramammary infection; prevalence; aetiology

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