Read that Plum trees can be bad for goats also? has anyone had experence with that? We have a section on the pasture with them in it, the horses dont seem to mind them.

Plum trees along with other trees in the same family (cherry, english laurel, apricot, etc.) have a cyanide precursor that is released when the leaf is "damaged" and wilted. From what I understand the seed part of the fruit also contains cyanide.
My goats can eat some Rhody without any problem but the Pieris Japonica (Japanese Andromeda) nearly killed one of them so I took those out of my yard.
False Hellebore (corn plant) seems fairly common in many of the areas I hike and the goats think the seed stalks and pods are candy canes. But those are bad news too.
Denise

The wilted leaves on any pitted fruit are bad news. They build up cyanide as they wilt.

Well my worry stems from that my nieghbor has an infestation of them. They are pretty thick from years of not trimming or even using the fruit. How worried should i be around them, there is a fence between but goats have their ways.

The danger is mostly with wilting leaves. Eating green leaves from the tree are usually not a cause for concern. Nor would a few stray leaves that happened to blow into the pasture on occasion. The problem would be if a limb broke off the tree and the leaves were wilting or their was a hard freeze that killed the leaves. Goats eating a quantity of leaves in this condition would be a problem. As Carolyn said, the wilting leaves contain concentrated toxins that are potentially fatal. Here is a good link to read more about it. The on line reference material at Merck is awesome. http://merckvetmanual.com/mvm/index.jsp ... 210800.htm