Management Strategies , Small Animal/Exotic Medicine , Toxicology

Lead and Zinc Toxicity in Birds

Joyce Huang BSFR, University of Georgia, Athens, Georgia

Joyce Huang is a recent graduate from the
University of Georgia College of Veterinary
Medicine and is currently working in a small animal private practice. She received her bachelor degree in Wildlife Sciences at UGA. Her clinical interests include zoological medicine, wildlife medicine, surgery, and anesthesia.

Joerg Mayer DABVP, DACZM/ECZM

Joerg Mayer is associate professor in zoological medicine at the University of Georgia. He received his doctoral degree from the University of Budapest/Hungary; completed an internship in zoological medicine and surgery at the Roger Williams Park Zoo in Providence, Rhode Island; and completed a Master of Science degree in wild animal health from the Royal Veterinary College in London, England. He also served as a clinical associate professor and head of the clinical service for exotic animals for 10 years at Tufts University in Boston, Massachusetts. In 2013, he received the Exotic Speaker of the Year award by the NAVC. In 2016, he received the Oxbow/AEMV Exotic Mammal Health Award, an annual award to recognize excellence and innovation in the field of exotic mammal health

Lead and Zinc Toxicity in Birds
AVIANS AT RISK Lead and zinc are considered to be the most commonly reported of avian toxicoses in both captive and free-ranging birds. Annette Shaff/Shutterstock.com
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Birds are extremely sensitive to changes in the environment, so much so that they have been used as sentinels for poisonous gas detection in coal mines and heavy metal, toxin, and/or chemical detection in bodies of water.1,2 They are sensitive to heavy metals (e.g., lead, zinc, cadmium, copper, mercury, iron) in their environment. Toxicity occurs when ingested metal causes harm to the animal. The heavy metals that most commonly cause toxicity are lead and zinc; less common causes are mercury and copper.1,3 Lead is a mineral not normally present in the body, but zinc is present in small quantities.4 Thus, zinc toxicity results from chronic and/or repeated exposure.

Sources of metal include weights (including fishing weights), batteries, pellets, paints, galvanized wire, costume jewelry, ceramics, contaminated material, hardware, post-1982 pennies, stained glass, food/water bowls, galvanized wire cages, and toys.1,3,5 In particular, lead can be found in house paints manufactured before 1978,1 and zinc toxicity most commonly comes from post-1982 pennies, zinc-coated wire, galvanized cages, and/or other metallic foreign bodies.4-6

This article focuses on lead and zinc toxicity in birds and describes case management.

Signalment

Heavy metal toxicosis is typically more severe in birds that are very young, very old, and/or compromised in some way. The most commonly affected species are psittacines, waterfowl, and raptors that have eaten prey containing lead shot.1

Lead is considered to be the most commonly reported of avian toxicosis in both captive and free-ranging birds.4 Waterfowl and raptors more commonly ingest lead shot (in prey or fishing gear) which leads to acute poisoning.

Presentation

Clinical signs of heavy metal toxicity in birds are nonspecific and often difficult to differentiate from other causes. However, heavy metal toxicity should be a top differential for birds showing neurologic signs. Heavy metal toxicity also becomes a more likely differential if the history reveals that the bird has chewed on walls or baseboards, new toys, or enclosures.

Lead toxicity: Lead is relatively insoluble, and the acidity of the proventriculus along with the mechanical action of the ventriculus can increase absorption into soft tissue and bone.4,6 Clinical signs of lead toxicosis can be multisystemic and affect the gastrointestinal, renal, urinary, and/or nervous systems and can cause gradual weight loss, polyuria/polydipsia, depression, weakness, anorexia, and/or rapid anemia1,4,6 (FIGURE 1). Birds can exhibit seizures or other central nervous system clinical signs of toxicity. Hemoglobinuria has been reported for affected Amazon parrots.1,4 Lead toxicosis can also cause a die-off of populations. Waterfowl, which may ingest fishing gear (e.g., lead weights, baits), can exhibit weight loss, neck and limb weakness, and bright green feces4 (FIGURE 2). Because lead toxicity occurs when lead is ingested, toxicity typically does not develop in wild birds shot with lead bullets.

Zinc toxicity: Clinical signs for zinc toxicosis include passive regurgitation, lethargy, weakness, weight loss, anemia, cyanosis, polyuria/polydipsia, diarrhea, regurgitation, neurologic signs, feather picking, anorexia, and/or hemoglobinuria.1,4,5 Cases of Amazon parrots with “chocolate milk” diarrhea and frank blood (hematuria) have been reported6 (FIGURE 3). Gastrointestinal ulceration can occur secondary to zinc toxicosis, possibly resulting from irritation and damage as the foreign material is ingested.4 If the gastrointestinal tract is perforated, the bird usually dies of sepsis and shock within 6 to 12 hours. In cockatiels, exposure to 2 mg zinc per week can be fatal.5

Heavy metal toxicosis is typically more severe in birds that are very young, very old, and/or compromised in some way.

Diagnosis

Because the routes of heavy metal exposure are typically external (physical contact) and/or consumption, tissues that can be used to assess concentrations of metals include feathers, egg, liver, kidney, and others. The metal content of feathers can be used to monitor environmental contamination.2 A tentative diagnosis can be based on history of exposure, clinical signs, laboratory results (mild anemia), and/or radiographs.4,6 Lead is best measured in liver and bone.1

Baseline complete blood count of a bird with heavy metal toxicosis would show leukocytosis and hypochromic regenerative anemia.1,3,4,6 Blood chemistry might show elevated levels of lactate dehydrogenase, aspartate aminotransferase, bile acids, and creatine phosphokinase. Birds with zinc toxicosis may also have elevated lipase, amylase, and uric acid levels.

Radiographs can reveal metal opacity in the gastrointestinal system, especially the ventriculus, but radiographic findings are not definitive1,3,4 (FIGURE 4). Definitive diagnosis is based on postmortem examination of the pancreas, liver, and kidneys. The organ of choice to test for zinc is the pancreas1,5; pancreatic zinc levels greater than 1000 mcg/g are suggestive of toxicosis.4


More specific testing can also be performed. In heparinized whole blood, 20 mcg/dL (0.2 ppm) lead is suggestive of lead toxicosis, and a concentration of 50 mcg/dL (0.5 ppm), paired with clinical signs, is diagnostic.1,3,4 Point-of-care lead testing machines are available for around $3300. Zinc serum/plasma levels can range from 2.5 to 29 ppm. Zinc serum/plasma levels as low as 2.5 ppm can cause clinical signs; 200 mcg/dL (2.0 ppm) is suggestive of toxicosis, and levels of 4.0 ppm are even more suggestive.1

Treatment

Treatment will vary according to whether the toxicity is acute or chronic. Treatment typically starts with stabilization/supportive care, prevention of further exposure, and delay of further absorption, all of which should be tailored to the patient’s clinical signs and may include gastric lavage, antagonist therapy, and toxicant removal.4,5

Supportive care: Supportive care includes controlling seizures and correcting anemia, immunosuppression, and anorexia. Supportive care includes administration of fluids (50 mL/kg SC or 10 to 25 mL/kg over 5 minutes as a bolus IV or intraosseously (IO) or at a continuous rate (100 mL/hr/day IV or IO), a heated environment (85°F to 95°F), and nutritional support.1,3 If the patient is severely anemic, a blood transfusion may be warranted. If the patient is stable, removal of the toxicant, if present, may not be necessary.

Medical treatment: Medical treatment includes anticonvulsants, fluid therapy, chelation, nutritional support, and antibiotics/antifungals. Antiemetic and/or prokinetics such as metoclopramide may also be indicated.3,4 Laboratory testing should be monitored during treatment and checked a few days after completion of treatment. Anticonvulsants include midazolam or diazepam given at 0.5 mg/kg IV, IM, or IN; midazolam is the preferred drug for IM administration.

The indication for chelation is based on severity, and supportive care is indicated. Calcium disodiumversentate (CaNa2EDTA) can be given at various dosages: 20 to 70 mg/kg IV diluted in sterile saline to a 4 mg/mL solution given q12h or q8h or 30 mg/kg SC given q12h until diagnosis is confirmed.7 Chelation is the preferred treatment and can also be given at 30 to 50 mg/kg IM or IV for 3 to 5 days, stopped for 5 to 7 days, and repeated as needed.1,3-5,7 Dimercaptosuccinic acid (DMSA/succimer) is a chelator that can decrease lead plasma levels and is given at 25 to 35 mg/kg PO q12h for 7 to 10 days or at 25 to 35 mg/kg PO q12h for 5 days a week for 3 to 5 weeks. Doses 80 mg/kg or higher are lethal.1,3,4,6,7 CaNa2EDTA (the preferred initial chelator) and DMSA are both effective, but the DMSA range of safety is smaller.1,2 D-penicillamine is another oral chelator that is given at 50 to 55 mg/kg PO q12h for 1 week, stopped for 1 week, and repeated if needed along with CaNa2EDTA.4,7 D-penicillamine can be given at 30 to 55 mg/kg PO q12h for 7 to 14 days. The main adverse effect is gastrointestinal upset.1,3,7 Long-term chelation can deplete zinc, iron, and/or manganese, so these values should be monitored during and after chelation.

For other toxicoses, hypercalcemia induced by lead toxicosis can be treated with disodium EDTA (Na2EDTA).1 Cadmium toxicosis can be treated with CaNa2EDTA. And mercury toxicosis can be treated with DMSA, vitamin E, and/or selenium.1,4

Source removal: To prevent further toxicosis, the source of the heavy metal needs to be removed and/or the patient needs to be prevented from chewing the source.6 If metal objects need to be removed, surgical procedures are indicated, but typically the need is not urgent if the bird improves after chelation therapy.1,3,4 Objects can be removed endoscopically (FIGURE 5), surgically, or with gastric lavage.

For gastrointestinal evacuation you can use bulk diets, lubricants, and/or cathartics (e.g., lactulose, mineral oil, barium sulfate, magnesium sulfate, or psyllium). Psyllium or other oral cellulose products (e.g., sodium sulfate) can be used at 125 to 250 mg/kg.4 Lubricants do not work well in waterfowl. For zinc-coated objects, a neodymium-ferro-boron alloy magnet attached to enteral tube can be used for removal.4

Prognosis

Prognosis depends on the patient’s response to treatment. Severely affected birds may be dehydrated and in hypovolemic shock, thereby contraindicating initial chelation therapy.3 If the patient responds well to initial treatment and the source of toxicity is removed, prognosis is generally good. However, if the patient does not respond to treatment or its neurologic status is poor, the prognosis is guarded to poor. Chronic exposure can lead to permanent neurologic, and sometimes gastrointestinal, damage.

References

  1. Lightfoot TL, YeagerJM. Pet bird toxicity and related environmental concerns. Vet Clin North Am Exot Anim Pract. 2008;11(2):229-259.
  2. Markowski, M, Kaliński A, Skwarska J, et al. Avian feathers as bioindicators of the exposure to heavy metal contamination of food. Bull Environ Contam Toxicol. 2013;91(3):302-305.
  3. Sanchez-Migallon D. Heavy metal toxicity. In: Tully TN, ed. Clinical Veterinary Advisor: Birds and Exotic Pets. St. Louis, MO: Elsevier; 2012:192-194.
  4. Richardson JA. Implications of toxins in clinical disorders. In: Harrison GJ, Lightfoot TL, eds. Clinical Avian Medicine. Palm Beach, FL: Spix Publishing; 2006.
  5. Puschner B, Poppenga RH. Lead and zinc intoxication in companion birds. Compend Contin Educ Vet. 2009;31(1):E1-12.
  6. Chow C, Pollock C. Heavy metal poisoning in birds. LafeberVet. Updated January 7, 2012. lafeber.com/vet/heavy-metal-poisoning-in-birds/ Accessed March 2018.
  7. Hawkins MG, Barron HW, Speer BL, et al. Birds. In: Carpenter JW, ed. Exotic Animal Formulary. St. Louis, MO: Elsevier; 2013:183-437.

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value='Lesotho' >Lesotho</option><option value='Liberia' >Liberia</option><option value='Libya' >Libya</option><option value='Liechtenstein' >Liechtenstein</option><option value='Lithuania' >Lithuania</option><option value='Luxembourg' >Luxembourg</option><option value='Macau' >Macau</option><option value='Macedonia' >Macedonia</option><option value='Madagascar' >Madagascar</option><option value='Malawi' >Malawi</option><option value='Malaysia' >Malaysia</option><option value='Maldives' >Maldives</option><option value='Mali' >Mali</option><option value='Malta' >Malta</option><option value='Marshall Islands' >Marshall Islands</option><option value='Martinique' >Martinique</option><option value='Mauritania' >Mauritania</option><option value='Mauritius' >Mauritius</option><option value='Mayotte' >Mayotte</option><option value='Mexico' >Mexico</option><option value='Micronesia' >Micronesia</option><option value='Moldova' >Moldova</option><option value='Monaco' >Monaco</option><option value='Mongolia' >Mongolia</option><option value='Montenegro' >Montenegro</option><option value='Montserrat' >Montserrat</option><option value='Morocco' >Morocco</option><option value='Mozambique' >Mozambique</option><option value='Myanmar' >Myanmar</option><option value='Namibia' >Namibia</option><option value='Nauru' >Nauru</option><option value='Nepal' >Nepal</option><option value='Netherlands' >Netherlands</option><option value='New Caledonia' >New Caledonia</option><option value='New Zealand' >New Zealand</option><option value='Nicaragua' >Nicaragua</option><option value='Niger' >Niger</option><option value='Nigeria' >Nigeria</option><option value='Niue' >Niue</option><option value='Norfolk Island' >Norfolk Island</option><option value='North Korea' >North Korea</option><option value='Northern Mariana Islands' >Northern Mariana Islands</option><option value='Norway' >Norway</option><option value='Oman' >Oman</option><option value='Pakistan' >Pakistan</option><option value='Palau' >Palau</option><option value='Palestine, State of' >Palestine, State of</option><option value='Panama' >Panama</option><option value='Papua New Guinea' >Papua New Guinea</option><option value='Paraguay' >Paraguay</option><option value='Peru' >Peru</option><option value='Philippines' >Philippines</option><option value='Pitcairn' >Pitcairn</option><option value='Poland' >Poland</option><option value='Portugal' >Portugal</option><option value='Puerto Rico' >Puerto Rico</option><option value='Qatar' >Qatar</option><option value='Réunion' >Réunion</option><option value='Romania' >Romania</option><option value='Russia' >Russia</option><option value='Rwanda' >Rwanda</option><option value='Saint Barthélemy' >Saint Barthélemy</option><option value='Saint Helena' >Saint Helena</option><option value='Saint Kitts and Nevis' >Saint Kitts and Nevis</option><option value='Saint Lucia' >Saint Lucia</option><option value='Saint Martin' >Saint Martin</option><option value='Saint Pierre and Miquelon' >Saint Pierre and Miquelon</option><option value='Saint Vincent and the Grenadines' >Saint Vincent and the Grenadines</option><option value='Samoa' >Samoa</option><option value='San Marino' >San Marino</option><option value='Sao Tome and Principe' >Sao Tome and Principe</option><option value='Saudi Arabia' >Saudi Arabia</option><option value='Senegal' >Senegal</option><option value='Serbia' >Serbia</option><option value='Seychelles' >Seychelles</option><option value='Sierra Leone' >Sierra Leone</option><option value='Singapore' >Singapore</option><option value='Sint Maarten' >Sint Maarten</option><option value='Slovakia' >Slovakia</option><option value='Slovenia' >Slovenia</option><option value='Solomon Islands' >Solomon Islands</option><option value='Somalia' >Somalia</option><option value='South Africa' >South Africa</option><option value='South Georgia' >South Georgia</option><option value='South Korea' >South Korea</option><option value='South Sudan' >South Sudan</option><option value='Spain' >Spain</option><option value='Sri Lanka' >Sri Lanka</option><option value='Sudan' >Sudan</option><option value='Suriname' >Suriname</option><option value='Svalbard and Jan Mayen Islands' >Svalbard and Jan Mayen Islands</option><option value='Sweden' >Sweden</option><option value='Switzerland' >Switzerland</option><option value='Syria' >Syria</option><option value='Taiwan' >Taiwan</option><option value='Tajikistan' >Tajikistan</option><option value='Tanzania' >Tanzania</option><option value='Thailand' >Thailand</option><option value='Timor-Leste' >Timor-Leste</option><option value='Togo' >Togo</option><option value='Tokelau' >Tokelau</option><option value='Tonga' >Tonga</option><option value='Trinidad and Tobago' >Trinidad and Tobago</option><option value='Tunisia' >Tunisia</option><option value='Turkey' >Turkey</option><option value='Turkmenistan' >Turkmenistan</option><option value='Turks and Caicos Islands' >Turks and Caicos Islands</option><option value='Tuvalu' >Tuvalu</option><option value='Uganda' >Uganda</option><option value='Ukraine' >Ukraine</option><option value='United Arab Emirates' >United Arab Emirates</option><option value='United Kingdom' >United Kingdom</option><option value='United States' >United States</option><option value='Uruguay' >Uruguay</option><option value='US Minor Outlying Islands' >US Minor Outlying Islands</option><option value='Uzbekistan' >Uzbekistan</option><option value='Vanuatu' >Vanuatu</option><option value='Venezuela' >Venezuela</option><option value='Vietnam' >Vietnam</option><option value='Virgin Islands, British' >Virgin Islands, British</option><option value='Virgin Islands, U.S.' >Virgin Islands, U.S.</option><option value='Wallis and Futuna' >Wallis and Futuna</option><option value='Western Sahara' >Western Sahara</option><option value='Yemen' >Yemen</option><option value='Zambia' >Zambia</option><option value='Zimbabwe' >Zimbabwe</option></select> <label for='input_6_10_6' id='input_6_10_6_label' 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