Potatoes, tomatoes, sweet and hot peppers, eggplant, tomatillos, tamarios, pepinos, pimentos, paprika, and cayenne peppers are classified as nightshade foods
Substances found in all nightshades are called alkaloids
Atropine , Scopolamine and Solanine are the toxins in nightshade plants.
The Atropine side of the family makes
cholinergic antagonists causing depression of the parasympathetic
system , while the Solanine producers make cholinesterase inhibitors ,
causing stimulation of the para sympathetic branch of the central
nervous system .
In other words if chickens eat too many seeds or greens from the nightshade family. It can cause them to lose muscle control" Twitching or unable to move" or organs shut down.
So if feeding them tomatoes and peppers make sure the seeds and stems are removed. They contain the highest amounts of these compounds.