Prevalence of clinical and sub-clinical mastitis on cross bred dairy cows at Holleta Agricultural Research Center, Central Ethiopia

Abstract

A study on bovine mastitis, designed to determine the prevalence and causal agent in cross breed dairy cow, was conducted from November, 2009 to March, 2010 at Holleta agricultural research center. A total of 90 cross bred cows were examined by physical examination and California mastitis test (CMT). Out of the total animals examined, 81.1% (73) had mastitis, in which 7.8% (7) and 73.3% (66) had clinical and sub clinical mastitis, respectively. Out of 340 quarters examined, 80.88% (275) were found to be infected in which 5.59% (19) were clinically and 75.3% (256) were sub clinically. Of 275 CMT and physically positive animals, quarter samples were taken for microbiological test in which, 66.4% (180) were culturally positive and 33.09% (91) were negative. Of 180 positive samples, the majority of isolates were Staphylococcus aureus (43.3%), followed by Micrococcus spp. (17.2%), Streptococcus agalactiae (12.2%), and Streptococcus dysgalactiae (7.2%). In addition, lowest isolation rate was for Streptococcus uberis and Streptococcus feacalis and each accounts for 2.8%. From this, proper mastitis control should be practiced by maintenance of an appropriate cow's environment and udder health management program in the farm including further investigation on risk factors associated to prevalence of mastitis and antibiotic resistance test to undertake measurable control options of mastitis in the farm.

Bovine mastitis: prevalence, risk factors and isolation of Staphylococcus aureus in dairy herds at Hawassa milk shed, South Ethiopia

“…In fact, our finding corroborate with earlier reports of 54.4 to 73.3% [11, 14, 15]. Likewise, the preponderance of sub-clinical mastitis and its serious economic relevance compared to clinical mastitis was underscored elsewhere [8, 25, 27, 33, 34].…”

“…The cow-level finding is comparable to a previous report of 51.7% from northern part of Ethiopia [16] and also other mastitis studies in the country which recorded S. aureus as the predominant agent [11–15]. Apart from Ethiopia, S aureus has also been reported as the chief aetiological agent of mastitis in cattle by many studies from African and Asian countries [8].…”

Mastitis in dairy cows: Prevalence, risk factors and Antimicrobial Susceptibility Test of major Bacterial isolates in Adea Berga District

“…This nding was less than what was reported by Amer et al [37], Tolosa et al[38], and Baraki et al [39] in Ethiopia. On the other hand, the prevalence of clinical mastitis was in agreement with previous studies, which reported 7.8% in HARC by Ararsa et al [40] and 9.9% in New Zealand by McDougall [41]. Overall, the present nding is in partial agreement with different study reports in Ethiopia by Kitila et al[36], in Pakistan by Ali et al [42], and in Kenya by Mbindyo et al [43].…”

Staphylococcus aureus in cow milk and milk products in Ambo and Bako towns, Oromia, Ethiopia: prevalence, associated risk factors, hygienic quality, and antibiogram

“…Consumption of raw milk and milk products including cream, butter, fermented milk ('Ergo'), cottage cheese ('Ayib'), and yogurt are common in Ethiopia [17]. However, the high incidence of SFP is likely to occur due to poor hygiene during food production and preparation, scarcity of cooling facilities [18,19], and raw milk consumption practices in the country [20]. Previous studies conducted in the Toke Kutaye, Dendi, and Cheliya districts of the West Shoa Zone, Oromia region, Ethiopia showed high isolation rate of Staphylococcus species from raw milk [22] and high prevalence of multidrug-resistant S. aureus in raw milk and milk products from a study conducted in Holeta, central Ethiopia [21].…”