Is there a list of things that chickens must not absolutely eat?

straightforward - put "Toxic plants for chickens" in search box and you will get quite a list, you can do the same for Toxic foods et al.
 
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Here's a list of foods to not feed chickens
Moldy Foods

Anything Salty

Asparagus-This will change the flavor of a hen’s egg to a bad taste but it otherwise is not harmful.

Avocado-Avocado has a fatty acid in it called “persin” which sadly can be fatal to chickens and sometimes other birds.

Green Areas of Potatoes, Peels and Potato Sprouts-All are poisonous to chickens and you personally shouldn’t eat them either!

Herbs and Plants to Stay Away from-Azalea, philodendron, rhododendron, sweet pea, black nightshade, foxglove, oleander, castor bean, vetch, henbane, irises, lantana, St. john's wort, trumpets vine, morning glory, datura, clematis and honeysuckle. If any of the herbs you are wondering about are not listed in this book, look them up before giving to your flock.

Leaves from Tomato, Pepper, Potato, Eggplant or Nightshade Plants

Onions-Onions contain a substance called “thiosulphate” which will kill red blood cells, cause anemia and sometimes even result in death.

Potatoes-Surprisingly, potatoes contain solanine which causes diarrhea, heart failure and kills red blood cells. However, sweet potatoes do not contain this substance and are perfectly fine and dandy to feed to your flock. Sweet potato fries are also fine as long as they aren’t salted.

Processed Foods and Sweets

Raw, Dry Beans

Raw Peanuts and Other Nuts

Rhubarb leaves-Rhubarb leaves surprisingly contain oxalic acid which is poisonous to chickens.
 

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