I. Respiratory avian influenza
1, epidemic characteristics: it can occur all year round, but it is more common in summer, late autumn and winter, showing obvious regional epidemic. This disease is characterized by rapid onset and spread. Laying hens began to have runny nose from 3-5 weeks old, and it became worse at 14- 15 weeks old. At first, they didn't add any feed, and their illness worsened, and sporadic deaths began to appear. The laying hens suddenly fell ill (called "one-night illness"). Colibacillosis and mycoplasma are often secondary or complicated.
2. Clinical symptoms:
(1) The laying hens have head tremors (shaking their heads) accompanied by rales. Chickens are characterized by watery eyes, round eyes with foam and edema on the head and face.
(2) Sick chickens are characterized by mouth breathing or screaming, coughing, runny nose and sneezing. The crown and flesh are cyanotic and even swollen.
(3) The trachea of most sick chickens is congested, and even the larynx has obvious bleeding point or bleeding point. Push out the larynx with your fingers, and you can see the mucosa in the upper part of the trachea (0.5- 1 ㎝).
(4) There was no significant change in the feces of birds with respiratory avian influenza. /kloc-laying hens over 0/00 days old died after 3-5 days.
3, autopsy lesions:
Mild chickens have nasal mucosa inflammation, sinusitis, alveolitis, thickening of airbag wall or cellulose cheese-like substances. Bronchitis, the whole tracheal mucosa is red, even there are spots the size of bleeding spots or needle tips, and the mucosa is slightly edema.
4. Diagnosis:
According to the onset season, epidemic characteristics and autopsy changes, it can be preliminarily diagnosed as laryngeal hemorrhage, pancreatic hemorrhage and cardiac hemorrhage. Diagnosis requires laboratory examination.
5, treatment prescription: mix with traditional Chinese medicine ice toad powder and take it according to the instructions.
Second, infectious bronchitis
1, clinical symptoms:
Respiratory tract type: sick chickens have no obvious precursor symptoms, and often have sudden respiratory symptoms, which quickly spread to the whole group. Young birds are characterized by craning their necks, breathing with their mouths open, coughing and purring, especially at night. With the development of the disease, the whole body symptoms are aggravated, and the sick chickens are listless, have poor appetite, loose feathers, drooping wings, lethargy, fear of cold and often crowded together. Sick chickens in less than two weeks often have symptoms such as swollen sinuses, sticky nose and tears, and sick chickens often shake their heads. After infection, the egg production of laying hens decreased by 25% ~ 50%, and soft-shell eggs, deformed eggs or sand-shell eggs increased.
2. Pathological features:
Respiratory type: the main lesions are found in respiratory organs such as trachea, bronchus, nasal cavity and lung. It is characterized by bleeding of tracheal ring and yellow or black-yellow embolus in the lumen. Chickens have congestion in nasal cavity and paranasal mucosa, viscous secretions in nasal cavity, edema or bleeding in lungs. The fallopian tubes of chickens are blocked, thinned, shortened or cystic. The follicles of laying hens are deformed or even broken.
Step 3 diagnose
This disease should be differentiated from Newcastle disease, infectious laryngotracheitis and infectious rhinitis in diagnosis. Newcastle disease in chickens is generally more serious than this disease, and nervous system symptoms are often seen in chicks. The respiratory symptoms and pathological changes of infectious laryngotracheitis in chickens are more serious than those of infectious bronchitis in chickens. Infectious laryngotracheitis rarely occurs in chicks, but infectious bronchitis can occur in chicks and adults. Facial swelling is common in chickens with infectious rhinitis, and it is rare in this disease. Renal infectious bronchitis is often confused with gout. Gout usually has no respiratory symptoms, is not contagious, and is mostly related to improper feed mix. It can be determined by analyzing protein and calcium and phosphorus in feed.
4. Treatment plan: the quick-acting kidney produced in Jizhong, Hebei Province has a good effect of dispersing branches, and of course it must be used with western medicine.
Third, infectious rhinitis
1, epidemic characteristics: the disease occurs in chickens of all ages, mostly in chickens over 4 weeks old, with an incidence rate of about 50% and a mortality rate of 20%. It is easy to be popular in summer and spring, and cold, humidity, overcrowding, poor ventilation and vitamin deficiency are all the causes of this disease. It is often mixed with chicken respiratory mycosis and chickenpox, which aggravates the illness and increases the mortality rate.
2, diagnosis points:
Runny nose, facial swelling or edema, conjunctivitis, sneezing; Breathing is difficult, the nasal cavity secretes smelly secretions, and chickens often shake their heads; Autopsy showed congestion and edema of nasal cavity, larynx and trachea mucosa, congestion of lungs and decreased egg production rate. Further serological diagnosis is needed.
3, treatment plan: oxytetracycline hydrochloride, doxycycline will do.
Fourth, chicken pox.
It can be caused by upper respiratory tract infection, and its clinical manifestations are skin type, mucous membrane type and mixed type. When the mucous membrane is infected, the mucous membrane of the mouth, throat and trachea appears ulcerative yellow-white lesions, accompanied by severe respiratory symptoms. Many sick birds have difficulty in eating and breathing because the false membrane of respiratory tract is too thick, so they can be peeled off with tweezers and coated with iodine glycerin.
Verb (abbreviation for verb) Prevention and control measures:
1. Strengthen feeding management and improve feeding environment.
2. The health and epidemic prevention system should be improved.
3. Do a good job in vaccination.
4. Drug prevention: It is necessary to give some proper drug prevention. Doxycycline, florfenicol and cefuroxime can be selected. 5. Strengthening all aspects of management, rational feeding, establishing and improving a strict scientific epidemic prevention system, and doing a good job in vaccination and drug prevention can effectively control the occurrence of respiratory diseases of laying hens in hot summer.