Trace metal accumulations in tissues of goats fed silage produced on sewage sludge-amended soil
Studies were conducted to document the impact of sewage sludge-fertilized corn (Zea mays L.) on the feed and food chain under controlled experimental conditions that eliminated any direct ingestion of sewage sludge by animals. Accumulations of trace metals were measured in various tissues of dairy goats (Capra hircus) consuming corn silage that contained up to 5.3 mg Cd/kg and 113 mg Zn/kg, for 3 consecutive years. The Cd concentrations in goat livers increased as the amount of silage-borne Cd increased and reached a high concentration of 2.94 mg/kg. Kidney Cd concentrations were approximately 10 times greater than those observed in liver, ranging from 3 mg/kg for animals fed control corn silage to 22 mg/kg for those consuming silage grown on soil amended with the highest rate of sewage sludge. However, this concentration is an order of magnitude less than the critical level suggested for induction of renal dysfunction. Kidney Zn ranged from 76.6 to 91.8 mg/kg with animals fed control silage having less Zn than animals fed sludge-fertilized corn silage. Concentrations of Zn in livers did not differ among treatments. Copper concentrations in livers and kidneys were significantly lower (approximately 2 mg/kg) in animals receiving sludge-fertilized silage than in animals fed control silage. The reduced Cu absorption may have been caused by a Cd and/or Zn metabolic interference. The elemental concentrations of 12 other metals and minerals in goat liver and kidney were not affected by treatment. Similarly, elemental concentrations in heart and muscle were not affected by treatment.
- Research Organization:
- Univ. of Minnesota, St. Paul
- OSTI ID:
- 5735170
- Journal Information:
- J. Environ. Qual.; (United States), Vol. 14:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
54 ENVIRONMENTAL SCIENCES
CADMIUM
BIOLOGICAL ACCUMULATION
COPPER
SEWAGE SLUDGE
ANIMAL FEEDS
BIOLOGICAL EFFECTS
ZINC
GOATS
HEART
INGESTION
KIDNEYS
LIVER
MAIZE
MUSCLES
TISSUES
ANIMALS
BODY
CARDIOVASCULAR SYSTEM
CEREALS
DIGESTIVE SYSTEM
DOMESTIC ANIMALS
ELEMENTS
FOOD
GLANDS
GRASS
INTAKE
MAMMALS
METALS
ORGANS
PLANTS
RUMINANTS
SEWAGE
SLUDGES
TRANSITION ELEMENTS
VERTEBRATES
WASTES
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