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OJVRTM
Online Journal of Veterinary Research©
Volume 17 (4): 167-176, 2013
Effects of fluoride
intoxication on teeth of livestock due to recent volcanic eruptions in
Patagonia, Argentina
WT Flueck
(PhD)
National Council of Scientific and Technological
Research (CONICET), Buenos Aires, Parque Nacional Nahuel Huapi, Argentina; and
Swiss Tropical and Public Health Institute, University Basel, Switzerland
ABSTRACT
Flueck WT, Effects of Fluoride intoxication on teeth of
livestock due to recent volcanic eruptions in Patagonia, Argentina, Onl J Vet Res., 17 (4): 167-176, 2013. The Puyehue-Cordon Caulle volcanic
eruption deposited large amounts of tephra (ashes) on about 36 million ha of
Argentina in June of 2011. Tephra were considered chemically innocuous based on
water leachates, surface water fluoride levels were determined to be safe, and
livestock losses were attributed to inanition and excessive tooth wear. To evaluate
chronic effects on livestock, mandibles from animals that died after August
2012 were evaluated. Clearly, these tephra caused dental fluorosis, with bone
fluoride levels reaching up to 3,253 ppm. Among sub-adults, tephra caused
pathologic wear of newly emerging teeth, with extremely rapid ablation of
entire crowns down to underlying pulp cavities. Although initial analyses of
water and tephra were interpreted not to present a concern, ruminants as a
major component of the affected landscape were shown to be highly susceptible
to fluorosis, with average bone level increasing several fold
during the first 15 or more months of exposure to tephra. Fluorosis in domestic
livestock due to volcanic eruptions has not yet been reported, yet the
described impact will affect morbidity, predation susceptibility, body growth,
reproductive success and longevity, with associated impact on livestock
production systems.
Keywords:
livestock, dental fluorosis, fluoride, pathology, teeth, tephra, volcanic
eruption.
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