[Biting mingles as carriers of bovine onchocercosis]
2007
Shabanov, R.T., The N.Eh. Bauman Kazan State Academy of Veterinary Medicine, Russian Federation
The species composition and development cycle were studied for biting mingles in the Middle Volga Region as carriers of bovine onchocercosis (BO). The most dominating and sub-dominating species are Odagmia ornata species. According to the parasitological study the infectivity of cattle with Onchocerca lienalis and O. digratata was 15-20%, mingles – 6-8%. BO ran in acute and chronic forms and was evident through edemas in the region of fetlock joint and stomach, lameness, depression and refusal to eat. As a means to control BO, ivermek was tested. The extensefficacy of this macrocyclic lactonese 10 days after treatment with it of 30 cattle heads at the dose of 1 ml/50 kg was 100% and maintained the same level for 90 days. At slaughter and examination of carcasses and internal organs of 15 animals with onchocercosis, in 15% filarial larvae were detected in gastrolinear ligament, hypoderm, synovial fluid of affected joints and muscular tissue. The sizes of onchocercal larvae in muscular hematomas were 1.3 cm, tendons of heel joints in mature female nematodes reached 36 cm, males – 3.5 cm. it is concluded that a predisposing factor of spreading onchocercosis among cattle is nearness of animal houses to water bodies – places of intensive breeding of biting mingles whose flying coincides with the onset of grazing period. The most effective anthelminthic is 1% ivermek solution at the dose of 1 ml/kg of body weight.
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