CHLORINATED NAPHTHALENE TOXICITY, HYPERKERATOSIS
 
Description    Hyperkeratosis due to chlorinated naphthalenes in petroleum products was a problem until they were removed from use in the 1950s; it is now rarely seen but exposure can be from dumps or old farm machinery. Skin lesions begin over the withers and lateral neck region then spread, but generally spare the lower legs; skin of the medial thighs can be thick.
 
Species   Bovine
 
Signs   Abortion or weak newborns, Alopecia, Anorexia, Cracked skin, Diarrhea, Dullness, Excessive salivation, Hyperkeratosis, Hypotonic, wrinkled skin, Lacrimation, Oral mucosal ulcers, vesicles, Prolonged gestation, Retained placenta, fetal membranes, Skin crusts, Skin scales, Underweight, poor condition, thin, emaciated, unthriftiness, ill thrift, Weight loss
 
References   Panciera RJ. Bovine hyperkeratosis: historical review and report of an outbreak. Comp Cont Ed Pract Vet 1993;15:1287
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