Lead concentrations in blood and milk from periparturient dairy heifers seven months after an episode of acute lead toxicosis
Journal Article
·
· Journal of Veterinary Diagnostic Investigation; (United States)
- California Veterinary Diagnostic Laboratory System-Toxicology Laboratory, University of California, Davis (USA)
In September 1988, 100 of 300 yearling dairy heifers developed blindness, tachypnea, foaming at the mouth, chewing, and facial fasciculations. Twenty-five animals died. Lead toxicosis was diagnosed based on the clinical signs and the presence of excessive concentrations of lead in whole blood, liver, kidney, and rumen contents of affected animals. The source of the lead was sudan grass silage that had been contaminated by soil that contained up to 77,000 mg/kg of lead. Lead concentrations were determined approximately 7 months after the acute episode of lead toxicosis. Whole blood and milk samples were obtained from heifers and a group of control cows 2 weeks prior to (blood only), at the time of, and 2 and 4 weeks after freshening. No lead was found in any of the milk samples (detection limit = 0.055 mg/liter). Animals that had been severely affected by lead toxicosis experienced a transient increase in whole blood lead concentrations at freshening that was not high enough to be considered toxic. No similar increases in blood lead were observed for control cows or heifers that had experienced milder toxicosis. These findings suggest that at parturition lead is mobilized into the blood of cattle previously exposed to excessive lead.
- OSTI ID:
- 5590384
- Journal Information:
- Journal of Veterinary Diagnostic Investigation; (United States), Journal Name: Journal of Veterinary Diagnostic Investigation; (United States) Vol. 2:3; ISSN 1040-6387; ISSN XZ051
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BIOLOGICAL ACCUMULATION
BIOLOGICAL MATERIALS
BODY FLUIDS
CATTLE
CONTAMINATION
DOMESTIC ANIMALS
ECOLOGICAL CONCENTRATION
ELEMENTS
FOOD
FOOD CHAINS
LEAD
MAMMALS
MATERIALS
METABOLISM
METALS
MILK
PREGNANCY
RUMINANTS
SOILS
TOXICITY
VERTEBRATES
540220 -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMALS
BIOLOGICAL ACCUMULATION
BIOLOGICAL MATERIALS
BODY FLUIDS
CATTLE
CONTAMINATION
DOMESTIC ANIMALS
ECOLOGICAL CONCENTRATION
ELEMENTS
FOOD
FOOD CHAINS
LEAD
MAMMALS
MATERIALS
METABOLISM
METALS
MILK
PREGNANCY
RUMINANTS
SOILS
TOXICITY
VERTEBRATES