The larvae are a pandemic disease caused by larvae parasitic in the nasal cavity and frontal sinus of the larvae. The damage is high and the infection rate is high. When the disease is serious, the sheep will die. The following is a small series to share the disease. Diagnosis and treatment methods and feeding management.
(1) Incidence and clinical symptoms
A breeder in Hanzhong City has a total of more than 160 dairy goats, insisting on self-supporting and self-supporting. In September 2017, the farmers found that some of the sheep in the flock kept shaking their heads and noses, not eating, and heard a fly fly close, rushing away, or burying their heads in the litter, or hiding their heads in other sheep's wombs. Under, not afraid of pain, rampage. The sick sheep appeared one after another in the following days. It is understood that in addition to the above, the sanitary conditions of the farm are poor. The sheep suffers from apathy, visible mucous membrane redness, nasal discharge, purulent nasal fluid, shaking head, dyspnea, nasal abrasion, molars, swelling of the face, partial movement disorders, whirlpool, convulsions, etc. Neurological symptoms. Combined with the initial diagnosis of the disease, it was diagnosed as larvae, timely taking corresponding treatment measures, strengthening disinfection and strengthening feeding management. The condition was quickly controlled. From the onset to the diagnosis, there were 34 cases and 2 deaths.
(two) pathological anatomy
There are sheep larvae, and the worms are found along the frontal sinus in the brain and the roots.
Anatomical disease of dead sheep only pathology, cervical lymph node necrosis, edema; abdominal cavity, chest internal organs no characteristic lesions; necropsy in the nasal cavity and adjacent sinus, nasal mucosa inflammation, hemorrhage, upper respiratory edema, found in the sinus, frontal sinus There are larvae of the larvae; open the cranial cavity, visible cerebral effusion, edema, meningeal damage, larvae of the sheep larvae in the brain, spray 2% trichlorfon into the nasal cavity of 5 sick sheep, all spray dead larvae .
(3) Laboratory inspection
Nasal nasal fluid of the diseased sheep was collected and made into a smear. After observation with a microscope, a large number of different stages of the larvae of the larvae were found. The length of 1 mm or so, the yellowish worms with 2 black front hooks on the front abdomen are the first stage larvae. The length of 25 mm or so, the elliptical worms with invisible thorns on the body surface are the second larvae. The third larvae are about 30 mm in length, and the body is divided into 8 sections. Many thorns grow in the front of each section. Dark brown capsular bands are present on each body segment, and a pair of black ones are present in the front abdomen. The front hook has a pair of black air holes at the rear end, and the whole body is brown. These larvae are the third stage larvae.
(iv) Diagnosis
Combined with the incidence, major clinical symptoms, pathological anatomical changes, laboratory tests, comprehensive diagnosis of sheep smut.
(5) Prevention measures
1. Treatment.
(1) 1% ivermectin is injected subcutaneously at 0.2 mg per kilogram of body weight, and once every 6 days;
(2) 0.15 ml per kilogram of body weight of cyanoacetamide sodium, intramuscularly injected;
(3) 3% of the children's liquid spray nasal spray, spray liquid 30 ml on both sides of the nostrils;
(4) Spraying liquid on both sides of the 3% trichlorfon solution in the nasal cavity, each side of the nostril can be sprayed into about 10 ml;
(5) 40% dichlorvos emulsion for indoor aerosol, 1 ml/m3, for 15 min.
2. Prevention.
(1) Regular cleaning, full disinfection of the housing, at the end of winter and early spring, clean up the cockroaches in the fence and the surrounding corners, and replace the litter with lime powder on the ground in time to keep the house dry, on the other hand It can induce sheep to sneeze and excrete the worms;
(2) Strengthening the management of manure, cleaning the pens every day, and concentrating the manure to effectively kill the larvae in the feces;
(3) Pay attention to temperature and heat in summer, keep the house cool, or put the flock in a cool place on a semi-sloping slope to prevent the sheep from getting together;
(4) In summer and autumn, adult raging, 1% of the dichlorvos ointment can be applied to the nasal cavity and nose of the sheep, and the dressing is changed once every other week, which can effectively prevent the adult larvae from producing larvae and killing larvae in the nasal cavity. Spray the fly murder on the surrounding walls to kill the adults.
It is understood that the infestation of the larvae and the lack of breeding management experience and the poor sanitation environment have a great relationship. Moreover, many farmers do not understand the disease, delay the treatment of the sheep snoring disease, and finally lead to the death of the sheep. The above is the symptom analysis and prevention and treatment skills of the larvae of the larvae.
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