A Philipsen wrote:Pine needles can cause abortions in cattle. Goats seem to be surprisingly tolerant of toxins (my one azalea is dead and my goats aren't), but that might be something to consider if your goats are or will be bred.
This winter I cut down pine
trees (have way too many of them) as a supplement to the goats
hay. They chomped through them happily all winter and all 5 bore healthy babies in the spring. So I'd guess its not a problem. What they really love is cedar trees (which are also a natural dewormer), they ate every needle off the cedar I cut down before they would touch the pine needles.