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Home > Resources > Pet Care Library > Horse Articles

Nitrate Poisoning in Horses

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Other issues include animals ingesting plants that are "borderline" in toxicity causing abortion, reduced milk flow, lower weight gains, vitamin A deficiency.

Plants to Watch Out For:

Field Crops Vegetables Weeds
alfalfa
millet
soy bean
barley
oats
soy bean
corn
rape
sudan
fescue
rye
wheat
beets
lettuce
spinach
celery
mangles
squash
cucumbers
parsnips
swiss chard
kale
radishes
turnips
bindweed
elderberry
Russian thistle
blue-green algae
fiddleneck
smartweed
bull thistle
goldenrod
stinging nettle
burdock
lambsquarter
sunflower
Canadian thistle
nightshades
velvetweed
carelessweed
ragweed
whitecockle

Management Practices

  • Feeding rations high in carbohydrates will reduce and some times prevent losses from nitrate poisoning.
  • Control weeds that accumulate nitrates. Freshly sprayed plants may become more palatable, so defer grazing of sprayed areas.
  • During periods of cool or cloudy weather. avoid grazing a suspect area if possible. During periods of sunlight allow’ animals to eat large quantities of dry forage and then graze the area.
  • Test the nitrate content of forage when in doubt.
  • Distinguish nitrate poisoning from prussic acid poisoning or grass tetany, so the appropriate treatment may be administered.

Oat hay moistened with water can convert nitrates to nitrites in a short time.

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