Bovine mastitis and antibiotic resistance patterns in Selalle smallholder dairy farms, central Ethiopia

Abstract

A study was conducted to determine the prevalence of mastitis, identify the major bacterial pathogens and test the antimicrobial resistance of milk bacterial isolates in smallholder dairy farms in Selalle area, Ethiopia. A total of 109 smallholder dairy farms comprising 500 crossbred lactating cows were included. The prevalence of clinical mastitis at herd, cow and quarter level was 8.3% (n=9), 1.8% (n=9) and 0.51% (n=10), respectively, while that of sub-clinical mastitis was 54.7%, 22.3% and 10.1%, respectively. The univariate logistic regression showed that among the risk factors considered, presence of teat lesion, stage of lactation and parity number had significant effect on the prevalence of sub-clinical mastitis. However, after multivariate analysis, only presence of teat lesion and stage of lactation had significant effect. The common isolates from the clinical mastitic quarters were St. agalactiae (30%, n=3) and St. dysgalactiae (30%, n=3), while from sub-clinical cases were S. aureus (42.6%, n=83), S. epidermidis (22.1%, n=43), St. agalactiae (12.8%, n=25) and St. uberis (10.3%, n=20). Staphylococcus intermedius and Streptococcus dysgalactiae were the species, which showed high level of susceptibility for most of the antimicrobials tested, while the remaining had varying levels of resistance for almost all the antimicrobials used. Among the antimicrobials employed, erythromycin and sulphonamide showed the lowest proportion of resistant isolates. Considering the possible significant economic losses that could be incurred by both clinical and sub-clinical mastitis, attention should be paid for further detailed investigations including the economic losses and benefits of interventions in the study area.

Incidences and antimicrobial susceptibility profile of Staphylococcus species isolated from animals in different Qatari farms

“…The study indicated that staphylococci was isolated most were from camels ' milk. This is in agreement with the findings by Kivaria et al (2007), Getahun et al (2008), Olde et al (2008) and Alzohairy (2011).…”

“…Pseudomonas species was higher than Grampositive bacterial genera, Staphylococcus and Corynebacterium; are known to be part of the normal microfolra and some can cause disease such as mastsides in cattle (Getahun et al, 2008;Holmes and Zadoks, 2011). These results are in agreement with other studies which indicated that the commonly isolated genera were Staphylococcus, Escherichia and Salmonella (Van Duijkeren et al, 2004;Alzohairy, 2011).…”

Incidence of Staphylococci and Streptococci During Winter in Mastitic Milk of Sahiwal Cow and Murrah Buffaloes

“…The major streptococcal strains isolated from this study was S. uberis found to be highest followed by S. agalactiae. Results are in agreement with previous studies [7,8,18]. The predominance of microbes varies with mastitic cases, geographical areas, breeds and climatic conditions as reported previously [8-10, 18, 20].…”

Screening of Bovine Mastitis in Lactating Dairy Cows in and around Debra TSIGE Town, North Ethiopia

“…Prevalence of subclinical mastitis (33.85%) is higher than that of clinical mastitis (9.64%) in the present study, which is agreement with several earlier reports from different parts of Ethiopia [25][26][27][28][29][30] since, environmental factors play significant role, the prevalence of subclinical mastitis varies in different dairy farms [31].…”