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Phenylmercuric acetate intoxication in mink
Abstract:
Mink died following an incidental phenylmercuric acetate (PMA) intoxication. Mortality was restricted to the older animals (31% in the females and 40% in the males). Of all organs the kidneys were most seriously damaged (tubulonephrosis) and contained the highest residual levels of mercury. No lesions were observed in the central nervous system. Twenty-one weeks after exposure mercury residues had declined to normal levels. The half-time of disappearance of mercury was 10 days in skeletal muscle, 22 days in kidneys, 27 days in brain and 36 days in liver. The reproductivity of the surviving mink was not affected by the PMA-intoxication.
Insights
Phenylmercuric acetate (PMA) intoxication caused mortality in older mink, primarily affecting kidneys. Mercury levels normalized within 21 weeks, and surviving mink reproduction was unaffected.
Area of Science:
- Toxicology
- Veterinary Pathology
- Environmental Health
Background:
- Phenylmercuric acetate (PMA) is a mercury-containing compound with known toxic properties.
- Accidental intoxications can occur, necessitating an understanding of its effects on animal health and environmental persistence.
Purpose of the Study:
- To investigate the pathological effects and mercury residue dynamics following incidental phenylmercuric acetate (PMA) intoxication in mink.
- To assess the impact of PMA exposure on mink mortality, organ damage, mercury clearance, and reproductive capacity.
Main Methods:
- Mink were exposed to phenylmercuric acetate (PMA).
- Mortality rates, clinical signs, and gross pathology were recorded.
- Kidney histopathology was performed to identify tubulonephrosis.
- Mercury levels in various organs and tissues were quantified over time.
- Reproductive success of surviving animals was evaluated.
Main Results:
- Mortality occurred predominantly in older mink (31% females, 40% males).
- Kidneys exhibited severe tubulonephrosis and the highest mercury concentrations.
- No central nervous system lesions were observed.
- Mercury residues returned to normal levels within 21 weeks post-exposure.
- Mercury half-lives varied by organ, with skeletal muscle being the fastest (10 days) and liver the slowest (36 days).
- Reproductive capacity of surviving mink remained unaffected.
Conclusions:
- Phenylmercuric acetate (PMA) poses a significant risk to mink health, particularly affecting older individuals and causing severe kidney damage.
- The body effectively eliminates mercury over time, with organ-specific clearance rates.
- Despite acute intoxication effects, long-term reproductive function in surviving mink is not compromised by PMA exposure.