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Butternut squash is very healthy for your chickens. Lots of vitamin A, which chickens need. It is especially beneficial when they are sick. I always have some chunked up in bags in the freezer. 
I think they would eat it either way, but I usually cook mine up before giving it to them. I don't personally know, but I assume they will eat the seeds too.
TYVVM! 
Chicken treats: Feed in moderation, and  
never give them old or moldy food. 
Apples: You can give them applesauce or fresh juicey apples. Yes, the seeds do contain cyanide, but the amounts are small, so don't worry. 
Bananas: I give my chickens a piece of banana, the first one to get it picks up the whole piece and runs away to eat it by themself. They love Bananas. 
Berries: All types of raw fresh berries 
Grapes: Fresh 
Melons: Cantaloupe, Honeydew, And watermelon. My chickens peck it down to the skin of the fruit. 
Pomegranates: My chickens love picking out each individual piece. 
Pumpkins: Raw or cooked, both seeds and flesh 
Tomatoes: Raw or cooked, my chickens like this ok.
Beans: Cooked for at least 10 minutes, never dry, all kinds. 
Beets: Cooked or raw. 
Broccoli: Raw or cooked some do, some don't 
Brussels Sprouts: Raw or cooked, this is good. 
Cauliflower: Raw or cooked O'yea. 
Cabbage: Raw or cooked if you have some, try it. 
Carrots: Raw or cooked, the whole thing. 
Corn: Raw, cooked, or canned, this is obvious, the stuff chicken food is made from. 
Eggplant: Raw or cooked. 
Lettuce: All the leafy greens are good for the chickens. 
Peas: Raw or cooked. 
Bell peppers: Raw or cooked. 
Sprouts: Make sure they are fresh. 
Summer Squash: All Squash, if you have a garden you will have plenty of this. 
Meats:
Chicken: Feeding chicken, chicken is ok. If you can't do this, feed them turkey. 
Fish: Be careful, this might change the flavor of your eggs. 
Meat: In very small amounts (hamburger, steak, roast, etc). 
Cereal: All kinds, watch the sugar. 
Cheese: All kinds, small amounts 
Cottage cheese: They love this. 
Flowers: You probably already know this. 
Grits: Cooked, This is a southern thing. 
Live crickets: They will jump for crickets. 
Leftovers: Human leftovers that are fresh, and low in fat and salt. 
Meal worms: This may be their most favorite, Chicken food for the soul 
Oatmeal: Raw or cooked. 
Pasta: Cooked, no hard stuff. 
Popcorn: If its corn, they like it. 
Sunflower seeds: I don't know what to say but try it. 
Yogurt: Plain or flavored, its good for their digestive system.
Follow these guidelines feeding chickens, and you will have happy and healthy birds. Too much of this stuff can have a negative impact on a birds health.  
Stay away from potato peels, (chickens can't digest easily). 
Spoiled and rotten food will make a chicken sick. 
Fish, onions, and garlic will give your laying hens eggs an unpleasant flavor.
If you suspect your chickens are not eating enough, try adding a little variety to their diet. Start by feeding chickens at different times during the day. Try these: 
Yogurt 
Milk. 
Cottage cheese. 
Tomatoes. 
Salad greens. 
Stir a small amount of water into their mash. 
If you are not successful in stimulating your chickens appetites, your chickens may be in poor health.