Isolation 0f Staphylococcus. Aureus Causing Bovine Mastitis In Khartoum North Locality, Khartoum State, Sudan.

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Esmaeil, Rogaya Haroun Mahamoud
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university of Khartoum
Staphylococcus aureus is one of the most common causes of bovine intrammary infections and mastitis worldwide and the most common mastitis pathogen isolated from raw milk. S. aureus is easily transmissible and the infection caused by it responds poorly to treatment. The economic losses due to S.aureus mastitis are considerable, and include decrease in milk production, reduced milk quality through contamination by bacteria and increased milk SCC, as well as veterinary and treatment costs and premature culling of infected cows. The aim of this study was to investigate bovine mastitis and some related risk factors in The East Nile Locality- Khartoum state and focuses on S. aureus mastitis. The samples were collected from two herds and included clinical and subclinical cases. 264 udder quarters from 66 dairy cows were collected and examined for mastitis, using California Mastitis Test (CMT). All positive samples were cultured and subjected to microbiological investigations. The study found that the prevalence of clinical mastitis was (18.83%); while subclinical mastitis was (46.32%). Overall, infection was detected in (69.7%) of all the animals examined. It was also found that (46.38%) of the samples from the whole udders were positive. Isolated bacteria were: Staphylococcus spp. 76 (46.63%), Streptococcus spp. 3 (1.84%), Micrococcus spp. 18 (11.04%), Bacillus spp.15 (9.2%), yeast 3 (1.84%), Enterobacteria spp.12 (7.36%), Corynebacterium spp. 26 (15.95%), Pseudomonas spp. 7(4.29%), Lactobacillus spp. 3 (1.84%). S. aureus was the most frequently isolated (38.65%). These results indicate that S. aureus remains a significant mastitis pathogen in The East Nile Locality. Infection rate was higher early in the lactation (25.45%) and increased thereafter to reach (52.73%) in the late stage of lactation. Management and hygienic factors significantly influenced the infection rate.
Isolation 0f Staphylococcus. Aureus Causing Bovine Mastitis In Khartoum North Locality, Khartoum State, Sudan