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Vet Hum Toxicol. 1987 Jun;29(3):230-3.

The induction of equine laminitis with an aqueous extract of the heartwood of black walnut (Juglans nigra).

Abstract

An aqueous extract of the heartwood of black walnut (Juglans nigra) was given via stomach tube to 10 horses. Eight developed Obel grade 3 or 4 laminitis within 12 hr. Limb edema and mild sedation were the only other clinical signs observed. One horse was euthanized due to severe signs. The other 7 recovered within 6 days. Gas chromatography/mass spectrometry of aqueous extracts of heartwood, bark and nuts of black walnut identified juglone in the bark and nuts, but not in the heartwood. It was concluded that the aqueous extract of heartwood is laminogenic to horses, but the active ingredient is not juglone.

PMID:
3604042
[PubMed - indexed for MEDLINE]
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