Some Studies on the Role of Goats in the Transmission of Malignant Ovine Theileriosis

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Khalid Mohamed Taha Abdel Aziz. ., Aziz
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The present study includes a twelve months survey of theilerial parasite in 600 of apparently healthy goats reared with sheep in Edamer province, River Nile State, Sudan. The survey was conducted through blood smears and lymph node biopsy smears for detection of piroplasms and schizonts, respectively. Results revealed a seasonal variation in prevalence of the parasite where 22.27% of examined goats were positive for theilerial piroplasm during autumn, while only 10.10% were positive during summer and 14.60% during winter. In an experimental infection, transmission was carried out from carrier goats to susceptible sheep by infected tick application and parasitized blood transfusion. Weak intermittent parasitaemia and weak signs of Malignant Ovine Theileriosis (MOT) appeared in infected sheep. A similar reverse transmission was done from clinically diseased sheep to susceptible goats. Less marked signs and parasitaemia were noticed in infected goats. Decrease in haemoglobin (gm/dl), RBCs. count and packed cell volume values was noticed in infected sheep more than in goats. On another aspect, the life cycle of Hyalomma anatolicum anatolicum, the vector of MOT, was carried out on six Nubian goats from Atbara town, Sudan, (two for feeding of each stage). The study revealed low infectivity of goats with the tick vector. Moulting periods of nymphs were very long. Engorgement weight of female ticks fed on goats was much less than engorgement weight of different ticks fed on other species in previous