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www.hunker.com/13428592/which-pine-trees-are-poisonous

The needles of at least 20 familiar pine trees are toxic and present serious risk to livestock. Although the needles, as well as the bark and branch tips, are toxic to horses, goats and sheep, cattle are especially susceptible to potentially lethal reactions, including premature births and miscarriages.

www.gardenguides.com/107322-pine-trees-poisonous.html

Native Americans drink pine needle tea, which allegedly has curative properties and is believed to cure scurvy. Pine needles are also made into a tea and pickled in some Eastern European countries. Not all pine varieties are edible, however; the ponderosa pine and several others varieties of pine trees can cause ...

www.reference.com/pets-animals/pine-trees-poisonous-dogs-3...

The poisonous pine trees include the ponderosa pine, the needles of which contain a certain acid that can cause fetal loss in cattle and other animals. Other pines that cause this same problem are the lodgepole pine and the common juniper.

www.quora.com/What-species-of-pine-tree-are-poisonous-to...

Many species of the genus Pinus have needles that can be used to make tea. Pine needle tea is rich in vitamins A and C; it’s a good decongestant; and you can also use it as an antiseptic wash. The flavor improves with a dash of lemon juice and/or ...

animals.mom.me/are-pine-trees-poisonous-to-cats-12400159.html

While the compound responsible for pine toxicity in cats has not been identified, both the sap and needles are known health hazards for pets, according to the American Kennel Club Canine Health Foundation.Cats may be tempted to play with or chew the needles, especially if they are laden with flashy ornaments.

www.shtfpreparedness.com/pine-trees-poisonous

All pine needles, regardless of the specific tree species they come from, contain lignols, resins and mycotoxins, which can produce toxic reactions in animals, such as livestock. But certain species of pine tree are known for having particularly toxic needles. Read the full article from ehow.com below: Which Pine Trees Are Poisonous?

csuvth.colostate.edu/poisonous_plants/Plants/Details/68

The Colorado State University Guide to Poisonous Plants database lists trees, shrubs and perennials that can be harmful to animals. The Poisonous Plant Guide is constructed to enable location of a plant by either knowing the common or botanical name of the plant. ... Other diterpine acids, and lignols isolated from pine needles may also be ...

www.ars.usda.gov/.../docs/pine-needles-published-research

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www.ars.usda.gov/.../docs/ponderosa-pine-pinus-ponderosa

The needles of ponderosa pine cause abortion when grazed by cattle. Induced abortions generally occur in late fall to early spring, during the last trimester of pregnancy. Cattle generally graze pine needles during storms with increased snow, wind, cold, changes in feed, or hunger. The toxin that causes abortion is isocupressic acid.

pets.thenest.com/evergreens-poisonous-cats-9794.html

In most cases, popular Christmas tree species, such as blue spruce and Douglas fir, are not poisonous to cats, though ingesting sharp needles can wreak havoc with a cat's digestive system. Other species of pine tree, however, particularly Norfolk pine, house pine and Australian pine, are toxic to cats.