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 140 g of zinc per cow per day for about 2 days was reported. The exposed cows
exhibited served enteritis, and some died or had to be slaughtered. Some
researchers have speculated that exposure to excessive amounts of zinc may
constitute a hazard to horses. Findings in foals living near lead-zinc smelters
suggest that excessive exposure to zinc may produce bone changes, joint
afflictions, and lameness. In swine given dietary zinc at concentrations greater
than 1,000 mg/kg, decreased food intake and weight gain were observed. At
dietary levels greater than 2,000 mg/kg, deaths occurred as soon as 2 weeks after
exposure. Severe gastrointestinal changes and brain damage, both of which were
accompanied by hemorrhages, were observed, as well as changes in the joints.
References
Integrated Risk Information Services (IRIS). (1992). On-line database.
National Academy of Sciences (NAS). (1980.) Drinking water and health.
Vol 3. Safe Drinking Water Committee, National Research Council. National
Academy Press, Washington, DC.
United States Environmental Protection Agency. (1980). Environmental Criteria
and Assessment Office, "Ambient water quality criteria for zinc," NTIS
PB81-117897, Cincinnati, OH.
D74
Appendix D Toxicological Profiles
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