We never planted cassava but we do plant tomatoes every year -- which our research showed that tomato leaves, vines, tomato skins and seeds are toxic (not poisonous) for human, animal, bird, or insect consumption -- only pests like aphids or tomato worms love tomatoes -- but all other life seems to avoid our tomato plants. The hummingbirds, butterflies, and bees won't go near the flowering blooms.Hi, I too am an avid gardener that grows cassava and beans such as pigeon peas but have always been very concerned about the chickens picking at them due to the cyanide content in the cassava. Are birds immune to it? Have you ever noticed any negative effects?
However, our hens never got the memo to avoid tomatoes and they will devour both leaves and tomatoes if they can reach them (they seem to prefer our Sun Gold Cherry tomatoes and leaves so we plant that variety just for the hens). Our oldest hen lived over 11 years eating tomatoes and leaves from the garden beds so I guess hens have the good sense to know when to stop eating?! Our hens get plenty of greens every day but they just can't pass up those tasty cherry tomatoes on the vine!
These Sikies are picking at the leaves of this Roma tomato plant but avoid the unripened fruit.
Now, when it comes to POISONOUS plants (i.e., oleander, etc) we absolutely avoid them!
The following links seem to list a very thorough variety of toxic plants for poultry and the plants' effects (probably not every poultry owner will agree with these lists but I found them helpful):
https://www.poultryhelp.com/toxicplants.html
https://www.grit.com/uncategorized/...oxic-to-dogs-cats-and-chickens/#axzz3KpE7wOXl