Control techniques of hard tick disease in sheep

Dense parasitism of ticks in sheep can cause weight loss in goats, miscarriage in some pregnant ewes, and high mortality in lambs and ewes after delivery.

The expert relieves the disease.

⑴ pathogen: the pathogen of this disease is 6 genera of Ixodidae, namely, hard tick, glass eye tick, blood tick, leather tick, shoulder tick and bovine tick. Its common morphological characteristics are as follows: the adult body is long oval, slightly protruding on the back and flattened on the ventral surface; there is no distinction between the head, chest and abdomen, and the three are integrated into a body with a false head at the front; the false head is composed of a pair of chelate limbs, a suboral plate and a pair of foot whiskers, and there is an oral hole between the chelate limb and the suboral plate. There are four pairs of feet on the ventral side of the body, each of which is composed of basal ganglia, trochanter, thigh, tibia, anterior tarsus and tarsus, with a pair of claws on the tarsus and a claw pad between the claws; there is a shield on the back of the ticks, and the scutellum of the female ticks is small, which only accounts for the first one of the back, and the male ticks occupy almost the whole back. There are various patterns, dots and grooves on the shield plate. There is a great difference in size between male and female ticks. The unfed female ticks and male ticks are like sesame seeds, while the full female ticks are as big as castor seeds, showing dark red or reddish brown, and the size of male ticks does not change much after feeding.

⑵ epidemic characteristics: in China, the distribution of ticks varies with climate, geography, geomorphology and other natural conditions. Some ticks are distributed in deep mountain slopes and hilly areas, some are distributed in forests and grasslands, and some live in livestock sheds and livestock stays. Generally, adult ticks overwinter under rocks or in ground crevices, and the active seasons of ticks vary with different tick families. Ticks are generally active on livestock from the end of February to the middle of November. Sheep are attacked by ticks, which mostly occur in the process of grazing and feeding, and the parasitic sites are mainly in the parts with short coat.

⑶ symptom: direct harm. After hard ticks invade sheep, local damage, tissue edema, bleeding and skin hypertrophy can be caused by oral organs piercing into the skin when sucking blood. Some can also be caused by secondary bacterial infection, such as suppuration, swelling and cellulitis. When young sheep are attacked by a large number of ticks, due to excessive blood intake, coupled with the toxins in the saliva of ticks enter the body to destroy hematopoietic organs, dissolve red blood cells, form malignant anemia, resulting in a sharp decline in blood tangible components. In addition, due to the toxin in the saliva of ticks, sometimes neurological symptoms and paralysis can occur, resulting in "tick paralysis."

An expert treats diseases.

① prevention: a, manually capture or use equipment to remove parasitic ticks on the body surface of sheep. B, eliminate ticks in the enclosure, some ticks can inhabit in the walls, crevices and caves of the enclosure, you can choose the above therapeutic drugs to spray or paint, and then plug with cement, lime and so on. C, to eliminate ticks in nature, rotational grazing can be adopted according to specific conditions, and the adults on the pastoral land can be wiped out after an interval of 1-2 years.

② treatment: a, subcutaneous injection of avermectin at a dose of 0.2ml / kg body weight; b, choice of 0.05% amitraz, 0.1% malathion, 0.1% new parathion, 0.05% chlorpyrifos, 0.05% Dianong, 1% carbaryl, 0.0015% deltamethrin, 0.003% cyhalothrin C, liquid spraying can use 1% malathion, 0.2% octyl sulfuric acid, 0.25 times parathion and other emulsions to spray livestock, with a dose of 200 ml each time, once every 3 weeks.