<unk> is a pathology which may occur in animals due to a lack of<unk> . A report given by E. Wayne Johnson et al. at the 2005 Alan D. Leman Swine Conference suggests that<unk> produces osteochondrosis in swine that is correctable by addition of 50 ppm of<unk>  to the diet. The tolerable daily intake (TDI) set by the World Health Organization (WHO) is 0.16 mg/kg of body weight for humans.
Boron deficiency 
Fluorine deficiency
Fluoride toxicity
Lead poisoning
Zinc toxicity
Chromium deficiency
Metal toxicity
Biotin deficiency