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Q: Perosis Overview

A:

Perosis Also called
Slipped tendon, chondrodystrophy

Prevalence-
Uncommon in layers, common in heavy, fast growing chicken breeds used for meat production

Signs
General signs -
Swollen hocks, one or both legs twisted to side, appearance of broken or bowed leg/s. In some cases (caused b niacin deficiency) the Achilles' Tendon may slip out of place and leg may be held at an odd angle, and the chicken may also have loose droppings. With folic acid deficiency, there may be brittle feathers, depigmentation of feathers, pale mucous membranes in the mouth, and pale comb. With biotin and pyroxidine deficiencies, the chicken may display dermatitis on the legs and feet
Cardinal or diagnostic signs -
Thickened bones in legs and wings on necropsy

Cause/s -
Nutritional deficiency of Choline, Manganese, and/or B vitamins (such as Niacin, Biotin, and Folic acid).

Communicability -
Not communicable, but many members of a flock may share this problem if they're on the same deficient feed

Communicability to humans -
No.

Incubation period -
None, but as a deficiency, it takes some time to develop. In chicks of fast-growing meat breeds, may start around 10 days of age

Latent
No

Endemic
No

Home treatment and/or prevention -
Prevention: Provide a good, fresh, nutritionally balanced feed for your flock. Don't make the mistake of offering something like scratch only, or kitchen scraps only.

Treatment: Supplement with Choline, B vitamins and Manganese.

Veterinary care - A veterinarian can diagnose this problem and suggest good supplements.

Recovery - Treatment will not correct damage, but will prevent the problem from getting worse or developing in other birds.

Other conditions, illnesses and/or diseases with similar signs:
Early stages may be mistaken for white muscle disease (nutritional muscular dystrophy), big hock disease (infectious synovitis), spraddle leg, broken limbs, or other illnesses causing leg problems.

Also consider browsing through this list of other chicken illnesses with neurological symptoms.