School of Veterinary Medicine

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Browsing School of Veterinary Medicine by Subject "Bovine"

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    Bovine mastitis prevalence and associated risk factors in dairy cows in Nyagatare District, Rwanda
    (2015) Iraguha, Blaise; Hamudikuwanda, Humphrey; Mushonga, Borden
    In response to farmer requests after milk from their herds was rejected by processors due to poor quality, a study was carried out from April to October 2011 to determine the prevalence of subclinical mastitis, associated risk factors and causative micro-organisms. Samples were collected from 195 dairy cows on 23 randomly selected dairy farms delivering milk to Isangano, Kirebe and Nyagatare milk collection centres in Nyagatare District, Rwanda. The Draminski Mastitis Detector was used to detect subclinical mastitis in individual cows based on milk electrical conductivity changes. Risk factors for mastitis that were evaluated included teat-end condition, cow dirtiness, breed, parity, age and stage of lactation. Relationships of these factors with mastitis status were determined using Chi-square analysis, and relative importance as causes of mastitis was assessed using logistic regression. Samples from 16 subclinical mastitis positive dairy cows were analysed to identify causative micro-organisms using Dairy Quality Control Inspection analytical kits. Subclinical mastitis prevalence was 52% across the farms. It was higher with increases in, amongst other risk factors, teat-end damage severity, cow dirtiness, and level of pure dairy breed genetics. The risk factors considered accounted for 62% of mastitis prevalence; teat-end condition alone accounted for 30%. Most of the mastitis cases (87.5%) were caused by coliform bacteria. Considering that farmers are upgrading their local Ankole cows to cross-breed dairy cows that are more susceptible to mastitis, results from this study indicate the need to dip the teats of cows in sanitisers, improve cow hygiene, and introduce mastitis prevention and control programmes.
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    Pathological findings of condemned bovine liver specimens andassociated economic loss at Nyabugogo abattoir, Kigali, Rwanda
    (2016) Habarugira, Gervais; Mbasinga, Gloria; Mushonga, Borden; Teedzai, Chitura; Kandiwa, Erick; Ojok, Lonzy
    There are no published abattoir bovine hepatic lesion prevalence studies in cattle in Rwanda. This studyestimated that 12.3% of the livers (n = 4751) examined at Nyabugogo slaughterhouse in Kigali were con-demned. Condemnation prejudiced the nation of 3492.00 kg of meat with attendant economic losses ofUS$8932.40 during the study period. Risk factors for these lesions were also assessed. Male and femaleanimals from 11 districts were used in this study. Hepatic lesions were higher in females (14.6%; n = 1494)than in males (11.1%; n = 3257). About 78.7% of the condemnations were due to fascioliasis, followed byabscesses (5.7%), hepatitis (5.3%), cirrhosis (4%) and other lesions (6.3%). Female animal livers showedmore fascioliasis and abscesses (82.2% and 9.5%) than male animal livers (73.3% and 3.3%). The high-est rate of condemnation was observed from Kayonza (40.2%; n = 413) and the least was from Gakenkedistrict (0.9%; n = 1031). Cattle from the Eastern Province showed significantly (P < 0.05) higher preva-lence of condemnations (26.8%) than the rest of the provinces. Liver specimens of animals below 3 yearsand above 6 years of age had a significantly higher (P < 0.05) condemnation rate (14.4%) (n = 3000 andn = 769) than the 3–6 year age-group at 4.1% (n = 982). We conclude that fascioliasis was responsible fora significant proportion of the liver condemnations at Nyabugogo slaughterhouse. Being a zoonosis, werecommend an epidemio-surveillance, implementation of control measures and anthelmintic resistanceinvestigation for fascioliasis in Rwanda.
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    Seasonal prevalence, body condition score and risk factors of bovine fasciolosis in South Africa
    (2017) Jaja, Ishmael F.; Mushonga, Borden; Green, Ezekiel; Muchenje, Voster
    Fasciolosis is an important zoonotic disease that is responsible for a significant loss in food resource and animal productivity. The objectives of this study were to determine the seasonal prevalence and risk factors associated with Fasciola infection in cattle. The results were obtained by coprology, antemortem and post-mortem survey of three abattoirs (HTPA1, n = 500, HTPA2, n = 400, and LTPA, n = 220). The seasonal prevalence of Fasciola infection was 10.4%, 12.8% and 10.9%, during summer, 11.2%, 10.8% and 8.6%, during autumn, 9.8%, 6.5% and 5.9% during winter and 8.2%, 7.8% and 5.9%, during spring in the three abattoirs HTPA1, HTPA and LTPA respectively. There was a significant association (p<0.05) between the intensity of infection and body condition score (BCS) of cattle at each abattoir. Factors such as age [HTPA1 (OR = 3.6, CI = 1.2, 10.2), and LTPA (OR = 3.8, CI= 2.4, 6.1)], sex [LTPA (OR = 4.2, CI= 2.5, 7.0)], breed [HTPA2 (OR = 2.3, CI = 1.3, 4.1) and LTPA (OR = 2.5, CI= 1.3, 5.0)] and BCS had significant (p<0.01–0.001) influence on the prevalence of fasciolosis. In conclusion, the infection with Fasciola spp was higher in the summer than in the winter; a positive association was established between the prevalence of fasciolosis and poor body condition in study animals. This study, therefore, suggests that fasciolosis could be causing substantial production losses, mainly due to cattle weight loss and liver condemnation.