What Not To Feed Chickens

These Four Common Foods Can Be Toxic to Poultry

by Ana Hotaling
PHOTO: Natalie Board/Adobe Stock

What not to feed chickens is as important as knowing what to feed chickens. When it comes to kitchen scraps, nothing beats chickens! These voracious omnivores will devour any leftovers coming from your fridge, table or prep counter. I keep a covered crock on my kitchen counter, which quickly fills with vegetable peels, corn cobs, unwanted rice and other tidbits destined for the chicken run.

Just because chickens can eat everything, however, doesn’t mean they should. These four foods are toxic and potentially deadly for chickens.

What Not to Feed Chickens – Spinach  

Fresh spinach salads are a summer-meal staple, tossed with everything from sliced eggs and chopped  walnuts to crunchy pepitas and juicy strawberries. While these toppings are totally safe for chickens, the spinach itself is not.

Spinach leaves contain oxalic acid, which binds with calcium, blocking its absorption into the body. This can be catastrophic for laying hens, leading to soft-shelled or no-shelled eggs, egg binding and skeletal issues. Also known as oxalates, oxalic acid can also cause kidney stones and renal failure.

How much spinach is too much? The answer varies, since no two birds are alike and flock owners define “in moderation” differently. Proponents of feeding chickens spinach point out that small amounts are beneficial to birds, due to all the nutritional positives provided by this leafy green … nutrients and vitamins that are already fully provided by chicken feed.

The safest option for your flock is to not offer spinach at all and, instead, provide safer greens such as dandelion leaves and beet greens, both of which are abundant during the summer. For me, toxic foods are best kept away from chickens altogether! 

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What Not to Feed Chickens – Potatoes 

Whole potatoes, wrapped in aluminum foil and cooked amidst charcoal briquettes, were part of every family cookout during my childhood. My sons, for some reason, dislike baked potatoes but adore potato salad and hand-cut fries, both of which are essential parts of our summer dining menus.

The sheer number of potatoes I peel to feed our family of six would floor you … and possibly earn me honorary citizenship in Idaho.

During prep, I make sure to carefully gather all my potato peels and carefully dispose of them in the trash. As much as I dislike adding biomass to the local landfill, I also understand that potato peels are laden with the alkaloid solanine, a toxin common to plants in the nightshade family.   

Effects of solanine ingestion by chickens include diarrhea, dizziness, arrhythmia, paralysis and death. Even buts of green potato flesh contain enough solanine to endanger your chickens. Because my birds free range—and to avoid potentially poisoning wildlife—my raw potato peels never get composted. However, fully cooked potatoes—and their peels—can be safely ingested by chickens.  

So remember: cooked potatoes are fine, but raw potatoes are one of the toxic food you must not give chickens.

What Not to Feed Chickens – Avocado  

Avocados and summer go hand in hand. I fondly recall plucking ripe avocados from my grandmother’s trees when I was a child. My Uncle George and I would sit on the low wall surrounding the garden, eagerly diving into these delicious home-grown treats with our spoons.

Every now and then, the avocados I picked were nowhere near ripe. My uncle would amuse himself by hurling these into the garbage bin. Every now and then, my grandmother would scold him, telling him we could always just set the unripe fruit on the wall to ripen for a few days. My uncle’s expression would grow serious and he’d reply, “You know we can’t.”

I never understood his mysterious words and solemn expression until years later, when I learned that not even a half ounce of avocado flesh was enough to fatally poison a parakeet.  It’s not just the avocado flesh: the skin, the pit, even the leaves all contain the toxin persin, which can cause labored breathing, myocardial necrosis (heart-tissue death) and death within hours of ingestion.  

Enjoy adding avocados to your summer salads and tacos but toss all leftovers, skins, pits and leaves in the trash. As far as foods toxic to chickens go, this is one of the really big ones!  

What Not to Feed Chickens – Stone Fruit 

Peaches, nectarines and cherries abound during the summer months. My husband Jae and I love going to our local farmers’ market to stock up on these fresh summer fruits, which we eat as snacks, as dessert and as ingredients in light, healthful entrees.

Our birds adore these fresh fruits as well and, when our enthusiasm causes us to buy more fruit than we can actually eat, we share them with our chickens … but not before we remove the pits.

All members of the Prunus genus—which includes chokecherries, almonds, apricots, cherries, nectarines and peaches—contain pits high in amygdalin. Amygdalin converts into the toxin cyanide when digested. Chickens poisoned by cyanide typically die with 15 to 30 minutes of ingesting the poison, which prevents cells from absorbing and using oxygen, causing irreversible cellular damage and death.

Share your summer fruits with your flock, as long as you first put the pits in their place: safely in the garbage can. 

This article about what not to feed chickens was written for Chickens magazine online. Click here to subscribe.    

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