It turns out that so many reasons can lead to leg disease in chickens.

1. Vitamin or trace element deficiency

(1) when vitamin B1 is deficient, the legs of the diseased chicken are soft and will not stand or lie down, with its head tilted upward in a stargazing position.

(2) when vitamin B2 was deficient, the tibia of the diseased chicken was dysplastic, the joint was enlarged, the claws were curled, and the hocks landed. Some legs spread apart, or one leg forward, one leg backward, similar to the symptoms of Marek's disease.

(3) when calcium, phosphorus and vitamin D3 are deficient or the proportion of calcium and phosphorus is out of proportion, there are cartilage and osteoporosis, thin bone wall and honeycomb in hollow bone, keel bent, ribs deformed and joints enlarged. Sick chickens lie down or lie on their sides and cannot stand and walk.

(4) when manganese, selenium, zinc and vitamin E were deficient, the leg bone was thick and short, the condylar joint was enlarged, and in severe cases, the leg bone was abnormally bent, the gastrocnemius muscle was displaced, and the leg extended to the outside, so that it could not stand and walk.

two。 Infectious disease

(1) viral arthritis: condylar joint enlargement, dark color, transparent, milky or blood-like secretions. There are more fibrous tissue between the tendons with a long course of disease, and the secretions become thicker.

(2) Marek's disease: the sciatic nerve is swollen, the leg is paralyzed and cannot stand. Most of the legs are damaged, forming a split shape with one leg forward and the other backward.

(3) adenovirus infection: long-term diarrhea in chickens infected with adenovirus. when the absorption of vitamin D, E, calcium and phosphorus was impaired, the diseased chickens had bone dysplasia, osteoporosis, separation at both ends of the long bone, bone rupture and necrosis, and the diseased chickens could not stand and walk.

(4) mycotoxin poisoning: mostly occurs in the mildew and rain season, mold infection poisoning caused by mildew in feed or bedding grass, enteritis and dysentery in diseased chickens, affecting the absorption of vitamin A, D, E, K such as calcium and phosphorus, which hinders the development of bones and shows weakness in the legs.

(5) synovial fluid cystic mycoplasmosis: mycoplasma infection is often accompanied by dyspnea, condylar joint enlargement, cheese-like secretion in the joint capsule, and claudication in severe cases.

(6) Staphylococcal infection: arthritis, synovial bursitis, toe cyst and claudication often occur due to staphylococcal infection caused by broken beak, crown cutting, sharp and hard objects in playgrounds and chicken cages, or unclean drinking water.

(7) chronic chicken plague: one or both legs are paralyzed and cannot stand.

(8) Avian cholera: chronic disease leads to enlarged joints and claudication.

3. Other diseases

(1) Drug poisoning: dysentery, furacilin, quinolinol, sulfonamides and other poisoning caused chicken leg paralysis, movement disorders, can not stand.

(2) Feed poisoning: rapeseed cake and cottonseed cake poisoning showed leg weakness, paralysis and paralysis.

(3) gout: when chicken leg gout occurs, the tarsal joint is enlarged, and there are calcareous substances in the joint capsule, showing weakness and lameness of the leg.

(4) Rheumatoid arthritis: chickens raised on dark and moist ground for a long time will cause rheumatoid arthritis and paralysis.

4. General prevention and control measures

(1) keep the chicken coop clean and hygiene. the density should be moderate and disinfect with 0.3% peracetic acid spray regularly.

(2) the full price compound feed should be used to ensure the need of vitamins and trace elements in the feed, and the proportion of calcium and phosphorus should be appropriate.

(3) when using drugs to prevent and treat diseases, the dosage should be accurate and should be stirred evenly when mixed with feed.

(4) the moldy and deteriorated feed is prohibited, and cottonseed cake and rapeseed cake should be detoxified before feeding.

(5) if abnormal chicken legs are found, in addition to comprehensive prevention and treatment measures, the cause should be identified and symptomatic treatment should be carried out.