The dermatitis, parakeratosis,  seen on the knees and breast of this chicken was caused by zinc deficiency.  Zinc deficiency also causes fraying of the ends of the feathers and the hock joint may become enlarged.

Parakeratosis of chicken knees caused by zinc deficiency

Credit: None

Digital Credit: Melissa Foster

Publisher: None

Rights: No rights reserved - image is in the public domain

Description: The dermatitis, parakeratosis, seen on the knees and breast of this chicken was caused by zinc deficiency. Zinc deficiency also causes fraying of the ends of the feathers and the hock joint may become enlarged.

Image Resolution: 2722x1866

File Size: 2507469 bytes