specially angerous ecause t s verywhere: Jakobskruiskruid

Last few years the yellow Jakobskruiskruid causes problems. Horses usually don't eat Jakobskruiskruid because of the taste. However, when they don't have any grass left they start eating this plant. The poison piles up in the horse's liver, which looses its function because of that. When the poison has arrived in the liver it stays there as long as the horse lives. Fresh Jakobskruiskruid tastes very bitter. If the plant grows in the land most horses will not touch it. When it is dried this plant is the most dangerous, because when it is in the horse's hay the horse will eat it.
 
Jakobskruiskruid blossoms in the month of July; best is to destroy the plant before it blossoms. Mowing the land prolongs the life of Jakobskruiskruid, that is why it is better to dig up or pull out the plant and its roots and to destroy it. But when you do this: wear gloves because the poisonous substance is absorbed through the skin.

specially angerous ecause t s verywhere: Buttercup

The Buttercup is mildly poisonous. Dried plants in the horse's hay will not do any harm, because the poison goes in the process. The yellow flowers warn the horse not to eat this plant.

General information
This is a common plant: you see it everywhere next to the roads and in the land. In the plant is a poisonous substance that has a sharp taste. Especially the Sharp and the Crawling Buttercup cause poisoning. Poisonous parts: the parts above the soil.

How poisonous is it?
In hay the Buttercup causes no damage, the poisonous substance anemonol has been changed to a non-poisonous substance.

Poisonous substance
Buttercups contain the glycoside ranunculine; bruising the plant causes the development of proto-anemonine. This is een volatile, yellow, bitter tasting oil which causes immediate polymerisation and that changes the poison to the harmless anemonin (anemonol).

Symptoms
Severe Buttercup poisoning causes colic and diarrhoea with black and smelly manure, nervousness, nervous twitches from ears and lips, difficulty with breathing and finally convulsions.