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Hungry or thirsty horses are more likely to eat poisonous plants, as are those pastured on overgrazed lands. [5] Animals with mineral deficiencies due to poor diets will sometimes seek out poisonous plants. [6] Poisonous plants are more of a danger to livestock after wildfires, as they often regrow more quickly. [7]
All parts of these plants are toxic, due to the presence of alkaloids. Grazing animals, such as sheep and cattle, may be affected and human fatalities have occurred. [106] Delphinium spp. larkspur Ranunculaceae: Contains the alkaloid delsoline. Young plants and seeds are poisonous, causing nausea, muscle twitches, paralysis, and often death.
Solanum carolinense, the Carolina horsenettle, [2] is not a true nettle, but a member of the Solanaceae, or nightshade family. It is a perennial herbaceous plant, native to the southeastern United States, though its range has expanded throughout much of temperate North America. [3]
Ageratina altissima, also known as white snakeroot, [3] richweed, [3] or white sanicle, [4] is a poisonous perennial herb in the family Asteraceae, native to eastern and central North America. An older binomial name for this species is Eupatorium rugosum , but the genus Eupatorium has undergone taxonomic revision by botanists , and some species ...
Crownvetch is toxic to horses and other non-ruminants because of the presence of nitroglycosides. If consumed in large amounts, it can stunt growth, or even lead paralysis and death. However, this is not true for ruminant animals such as cattle, goats, and sheep. [ 12 ]
The stems are covered with nettle-like spines less than 0.5 cm (0.20 in) long, [4] ranging from very few on some plants to very dense on others. Leaves and stems are covered with downy hairs ( trichomes ) that lie against and hide the surface, giving a silvery or grayish appearance.
If this was a "plants poisonous to mammals" I could see the comparison, or even if it was a "plants poisonous to livestock" I could see a comparison between horses, cattle, sheep, pigs, etc., but I'm just not seeing horses vs. humans in an article specifically about horses. Dana boomer 20:13, 13 December 2010 (UTC)
It is toxic to cattle, dogs, sheep, pigs, and horses, and is also linked to cancers in humans. [5] It can harbour high levels of sheep ticks, which can pass on Lyme disease . Grazing provided some control by stock trampling, but this has almost ceased since the 2001 foot-and-mouth disease outbreak reduced commercial livestock production.