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I'm finding seemingly contradictory information with a normal search (forums). Many sources say that their own goats love pine needles and there's nothing wrong with letting them eat them. Occasionally somebody jumps in to say that pine needles can cause a miscarriage in bred does. I suppose both can be true. Any reliable source of info out there?

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    Welcome to Sustainable Living! Although eating can be seen as a form of recycling, your question is much more about biology than it is about sustainability. Perhaps somebody here knows something about goats, but I think you'll have a better chance of getting a good answer at Biology SE? – THelper Oct 6 '13 at 17:37
  • or possibly even the skeptics SE? – Charlie Brown Oct 11 '13 at 8:02
  • I would be surprised as I've seen a goat grab a lit cigarette out of a guys hand and eat it 'cherry' first. It seems to me goats have iron stomachs. – Charlie Brown Oct 14 '13 at 3:34
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    I think it's a legit question about sustainability because keeping livestock is an important part of sourcing ones own food and that's a sustainable thing to do. – Joshua Frank Oct 16 '13 at 2:16
  • My friend requested all of his acquaintances deposit their christmas trees in his goat pen. The goats stripped them to trunk and twigs. They lived a long time. – That Idiot Jan 9 '18 at 17:05
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My father's goats love pine, not just the needles but the young and flexible twigs too. So much so that most of the pinetrees in the feeding area lost the branches under 1,5 meters or so.

They never had a miscarriage, but had a lot of false pregnancies. I do not know if those have anything to do with pine.

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I have been told that pine is a natural de-wormer for goats. I always give mine a few descent size branches when they show signs of worms. They usually will try their hardest to get to the branches even when they have plenty to forage on. Never had any issues and the worm problem is usually eliminated.

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There is quite a lot of info on the web in general, from this big list of poisonous and ok plants (repeated in various places with no source or attribution - pine is on the ok side). A more definitive answer comes from this summary of two research papers containing this excerpt:

No abortions occurred, however, toxicity was observed in the 3 treated groups. The pine tips were most toxic, the bark less toxic and the needles least toxic. Clinical signs of toxicity included muscular weakness, trembling, unusual stance, rumen stasis, bloating, opisthotunus, depression, loss of appetite, and death. Necropsy revealed no significant gross lesions. Pine needles, tips, or bark do not cause abortions in goats but are potentially toxic…"

My experience is that goats will eat pine trees if given the opportunity, so it's probably wise to keep pregnant ones away from the trees. But they do generally seem to prefer grass and trees with bigger leaves. My experience of goats eating young trees (including pines) suggests that that should apply to any tree you don't want the goats to eat. Note that goats are climbers, and will eat much more of the tree than you would expect, if they can get access.

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Some pines can act as abortifacients and possibly cause renal damage because they contain isocupressic acid.

Ponderosa pine is the one I know of, because we have some near our goat pasture and have to keep them fenced out of it. I have heard that juniper and a few other conifers might have this problem too.

On the other hand, our goats love douglas fir needles and young bark, and have eaten it regularly for 9 years with no miscarriages.

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Well, it seems a little is ok.

I think we have over done it with out goats, given them too much too quickly. Seems to be a problem with gut bacteria and not having time to adjust to the new feed.
We had 2 huge pines cut down in the yard and have been chucking branches into the goat pen all week, so they don't have much choice.

Bad move - our one doe couldn't get up last night and is very week and bloated, all the others look ok, but seem like they have slight signs of bloat and weekness.

There was a study that someone referred to in a post about this very issue, it suggested that the tips are the more toxic part, and if they have too much it's a problem.

Bottom line: I think if you have decent pasture they will eat a bit of everything. Don't feed them pine exclusively.

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    There was a study that someone referred to in a post about this very issue Please add a reference – user2451 Jul 25 '16 at 12:14
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I have a goat that's been sick for years and the pasture she's in is in the middle of a pine forest (bull pine to be exact). Whenever she's out and about she always takes a nibble on some pine trees and it's impossible to get her away until she is satisfied. I found a way to use this to my advantage and even out the harmful with the helpful. I take molasses and glaze some over the pine trees, to single out the trees they like, and then I put about half a cup of loose minerals over it. It encourages them to eat their minerals and to lessen the amount of pine they eat.

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    Welcome to Sustainability.SE! Thanks for the answer, and this seems like a helpful tip -- however, how does this limit the amount of pine that the goats eat? Do they get full on the molasses, or does it make eating the pine harder? – LShaver Feb 4 '18 at 1:10

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