Untitled

Abstract

A study on bovine mastitis, designed to determine the causal agents, prevalence of infection and impact of risk factors in three cattle breeds, was conducted in selected areas of southern Ethiopia. A total of 307 lactating and non-lactating cows, of which 162 were indigenous Zebu, 85 Jersey and 60 Holstein-Friesian. were examined by clinical examination and the California mastitis (CMT) test. Of these, 40.4% were positive by CMT and bacteriology for clinical or subclinical mastitis, with prevalence rates of 37.1% and 62.9%, respectively. Out of 1133 quarters examined, 212 (18.7%) were found to be infected, 83 (39.21%) clinically and 129 (60.8%) subclinically. The prevalence of mastitis was significantly higher in Holstein-Friesian than in indigenous Zebu, in non-lactating cows than in lactating cows, in the early lactation stage than in the mid-lactation stage, in cows with lesions and/or tick infestation on skin of udder and/or teats than in cows without this factor, and in the wet season than in the dry season. Mastitis increased with parity number (R = 0.9). Of 248 CMT and clinically positive udder quarter samples analysed microbiologically, 212 were culturally positive for known mastitis pathogens and 36 were negative. Of the 199 positive samples. Staphylococcus accounted for 39.2%. Streptococcus for 23.6%, coliforms for 14.1%, Micrococcus and Bacillus species for 8.0% each and Actinomyces or Arcanobacterium (Corynebacterium) for 7.0%. It was concluded that there was a high prevalence of clinical and subclinical mastitis, mainly caused by Staphylococcus aureus, Streptococcus agalactiae and Escherichia coli, in this study area.

Mastitogenic bacteria isolated from dairy cows in Kenya and their antimicrobial sensitivity

“…(Table 4). This agrees with the findings of Dego and Tareke (2003) and El-Attar, Salama and Abd El Samie (2002), who reported that Staphylococci and Streptococci caused up to 90% of bovine mastitis in Egypt and Ethiopia.…”

Prevalence and major bacterial causes of bovine mastitis in Asella, South Eastern Ethiopia

“…The results of the sub clinical mastitis in this study also in comparable prevalence with those previous reports in Ethiopia (Mungube et al 2004;Biffa et al 2005;Getahun et al 2008). The quarter infection rate in this study was higher than the quarter infection rates reported by other findings (Kerro and Tareke 2003;Mungube et al 2004;Mungube et al 2005;Getahun et al 2008).…”

“…Further study is required to evaluate the breed difference. The study determined the increasing prevalence of mastitis with an increase in parity number, this is in agreement with findings by Kerro and Tareke (2003), Mungube et al (2004), Biffa et al (2005) and Getahun et al (2008). Moreover, Quinn et al (1994), have also stated as if older cows, especially after four lactations are more susceptible to mastitis.…”

“…In Ethiopia mastitis has long been known (Workneh et al 2002;Kerro and Tareke 2003;Mungube et al 2004;Getahun et al 2008;Almaw et al 2008). However, the information on the prevalence of the diseases in South Eastern part of the country in general and Asella in particular is inadequate.…”

Prevalence and Bacterial Isolates of Mastitis in Dairy Farms in Selected Districts of Eastern Harrarghe Zone, Eastern Ethiopia

“…Other studies shared similar observations [21, 22, 43, 44]. This could be attributed to the invisible and silent nature of subclinical mastitis which is usually given little attention by farms when it comes to treatment unlike clinical mastitis towards which treatment and control efforts are concentrated [39, 45].…”