Peaches, Plums and Other Stonefruits
Wilting of the green leaves caused by frost, storm damage, or cutting precipitates changes to glucoside found in the leaves, changing it to hydrocyanic acid (HCN) and sugar. Those sweet, wilted leaves are more attractive to goats than fresh foliage. HCN content varies widely; but under some conditions, a few handfuls of leaves are enough to kill much larger animals such as horses or cows.
So, a cyanide poisoning should be suspected when sudden death of animals follows windstorms or an early, sharp frost. These leaves apparently lose their poison after they have become dry; it's the limp, green or partially yellowed leaves that hold the greatest danger. Stone-fruits also belong to this group.