Learn these 6 points to easily identify chicken respiratory diseases!
1. Symptoms of chronic respiratory disease in chickens
There are air bubbles in the eyes of sick chickens, and swelling of the upper and lower eyelids. At the beginning of the disease, young chickens make the sound of "spraying red and spraying red", with serous and mucous nasal fluid, coughing, sneezing, and respiratory rales. There may be cheese-like substances of different sizes in the eyes with a long course of disease, which may oppress the eyeball in severe cases. Cheese-like substances accumulate in the infraorbital sinus under the eyelids and protrude outward, like "goldfish eyes". Adult chickens are recessively infected, the egg production rate decreases, and the proportion of soft-shell eggs increases.
Necropsy of sick dead chickens revealed secretions in the nasal passages, trachea, and bronchi, swelling of the mucous membranes, and off-white mucus on the surface of the mucous membranes. The walls of the air sacs are turbid, and there are plant-like dots on the air sacs. During the course of the disease, there are various yellow cheese substances under the thoracic air sacs or abdominal air sacs, and there are a lot of air bubbles between the intestinal tubes in the abdominal cavity.
2. The symptoms of chicken infectious rhinitis show
that the incubation period of the disease is short, 1-3 days for natural infection, and 16-48 hours for artificial infection through nasal cavity and sinuses. The main symptoms are rhinitis and sinusitis. The first is the discharge of serous fluid, which is especially prominent when feeding and encountering cold air. One or both sides of the sick chicken's face, infraorbital sinus, swelling, eyelid edema, purulent cheese accumulation in the corner of the eye, and foul smell Odor, mouth breathing often occurs, and with a grunting sound.
Cut the middle part of the nose, there is a lot of nasal fluid and yellow exudate in the nasal cavity, and mucus flows out when it is lifted upside down. If the course of the disease is long, it can be seen that the nasal sinuses, infraorbital sinuses and conjunctiva accumulate cheese-like substances. Excessive accumulation often makes the eyes of sick chickens protrude outwards, causing eyeball atrophy and damage in severe cases, and eyes are blind. The follicles of laying hens are soft and easily broken, causing yolk peritonitis, and the egg production rate can drop by about 25%.
3. Symptoms of chicken-borne throat-borne respiratory disease The
typical symptoms of sick chickens are mouth stretching, "hemoptysis", elongated sound, strange cry, commonly known as "back and forth sound". Acute cases show obvious dyspnea, cough up bloody mucus hanging on the chicken coop or throwing on the ground. In chronic cases, the throat is blocked by light yellow cheese, and often dies of suffocation.
The dead chicken was autopsyed, and the nasal cavity was severely congested, hemorrhaged, and there was a lot of nasal fluid. In acute cases, the throat and tracheal mucosa of chickens were festered and bleeding, with needle-like bleeding points, and there was a lot of bloody sputum in the trachea; in chronic cases, the throats or trachea of chickens were blocked by yellow-white cheese.
4. Symptoms of chicken transmission
Infectious bronchitis is divided into respiratory, renal, and reproductive types in terms of clinical symptoms.
a. Respiratory: Sick chicks show dyspnea, try to stretch their necks, open their mouths to breathe, and can't make a sound. The mortality rate can reach 25%. Autopsy of dead chickens revealed serous or yellow-white cheese-like substances in the lower segment of the trachea and bronchi.
b. Kidney type: There are slight respiratory symptoms, which can only be heard at night. The sick chickens huddle together and discharge white watery feces. The mortality rate of chicks is 10-30%. Autopsy of the dead chicken revealed that the kidneys were enlarged, light pink like peanuts, white urate particles could be seen on the surface of the kidneys, and the ureters were enlarged and white.
c. Reproductive type: Adults do not lay eggs, walk like penguins, have more deformed eggs, and egg whites are as thin as water. The fallopian tube is dysplastic, short and occluded, and sometimes serous cysts of different sizes are formed in the enlarged part of the fallopian tube, which looks like a bladder and cannot produce eggs.
5. Symptoms of chicken plague The
typical symptoms of sick chickens are neck twisting, neck bending, turning in circles or looking up at the stars, straight forward or backward and other mental symptoms, dark red combs, and abnormal or strange sounds of "generlou". Green and thin feces are discharged, the crop is inflated, and the crop is filled with sour liquid and gas, and mucus is poured out of the mouth.
The characteristic lesions of the dead chickens after necropsy were below the 1/2 of the descending part of the duodenum, 2-5 cm below the yolk pedicle, the corresponding parts of the two cecum and the ileum, and three lymphatic aggregation bubbles in the form of "jujube stones". "like" hemorrhagic ulcer; gastric content green, glandular stomach papilla bleeding, swelling, glandular stomach and gizzard junction bleeding; cecum tonsil swelling bleeding ulcer, rectal bleeding in spots or streaks; follicles deformed in a "cauliflower-like" shape, or The follicle ruptured, and there was a liquid yolk-like substance in the abdominal cavity; slight bleeding in the larynx, and needle-like bleeding in the heart and coronary fat.
6. Symptoms of Avian Influenza The symptoms of
low pathogenic avian influenza and highly pathogenic avian influenza are similar, but low pathogenic avian influenza usually has a mild onset and milder superficial symptoms. Affected chickens discharge yellow-white-green loose stools, black and purple crowns, dry necrosis at the edges, and edema on the face and beard. The typical symptoms of sick chickens are bleeding from the scales on the feet, and some sick chickens scream strangely, stretch their heads and necks upwards, and make roaring sounds. The egg production of laying hens decreased until it was completely produced, and the number of soft eggs, sandy eggs, and blood-spotted eggs increased.
Autopsy of the sick dead chicken revealed that the breast muscles were purplish red or white like boiled meat, the base of the glandular stomach papilla was bleeding and covered with a layer of secretion that could not be scraped off, the junction of the glandular stomach and the gizzard was bleeding, and the horny layer of the gizzard was Easy to peel off. The pancreas is purplish red with transparent or dark red necrotic foci, which are characteristic lesions. Follicle congestion and bleeding, from golden yellow to bright red, fallopian tube congestion and edema, with a lot of sticky white secretion inside. The liver is enlarged and hemorrhages, with yellow stripes, crumbly like bean dregs. The kidneys are enlarged and show a mottled kidney. Coronary fatty hemorrhage, sometimes epicardial hemorrhage. Laryngeal and tracheal mucosal bleeding, tracheal ring bleeding, more bloody sputum.