Mastitis is an important disease worldwide that causes economic losses by affecting the health of dairy cows and milk quality. Moreover, mastitis has an effect on animal welfare and may threaten public health because of shedding of antimicrobial residues and resistant bacteria in milk. In Ethiopia, mastitis is one of the most prevalent diseases of dairy cows and reduces the efficiency of milk production. A study was done with overall objective of contributing to the knowledge on mastitis in Holstein Friesian × Zebu breed market-oriented dairy farms in North-Western Ethiopia.
In a study on 510 cows, 33% of the quarters and 62% of the cows had subclinical mastitis (SCM). Coagulase negative staphylococci (CNS) and Staphylococcus aureus were the pathogens most frequently isolated. A number of risk factors for mastitis were identified, such as a history of clinical mastitis (CM), checking the udder for CM and Holstein Friesian blood level. The genetic relatedness of the S. aureus isolates was studied using spa-typing. Although twenty different spa types were identified, almost 70% belonged to the same cluster, suggesting within and between farm transmission. In addition, these isolates were found to be mostly resistant to penicillin/ampicillin (86%) and tetracycline (54%).
A normative bio-economic simulation model estimated the total costs of mastitis under Ethiopian circumstances to be 6,70
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