Greetings
Lydia parker,
I am assuming your sussex is a pet chicken? She will need a lot of attention and specially prepared meals. I have done this many times, for many chickens. It's not hard if you prepare things in advance and refrigerate them.
When chickens go off feed, there are many things they can eat. If you cook the grains, vegies, and protein, it will be easy for her to digest them. A diet of rice and oats will not provide the essential, protein, fiber, vitamins, minerals and fats that the chicken needs. Chickens are omnivores.
I like to prepare what I call "confetti meals" for chickens that go off feed. They consist of the following:
- Carbohydrates (energy) - cooked brown rice, pearl barley, oat groats, wheat berries, shredded potato, corn niblets or creamed corn, a small amount of cooked pasta occasionally (orzo, and bits of vermicelli are good).
- Cooked protein - Turkey, tofu, white albacore, beef, pork, egg (ground meats are best for your chicken)
- Cooked vegetables - Fresh or Frozen vegies (dice green beans)
- Fresh greens - kale, chard, mustard, turnip tops, diced cucumber
- Fruits - cooked apple, a bit of diced fresh black or red grapes, diced pear (cooked or fresh), small amount of melon, diced fresh or cooked tomato
When putting together meal combinations, start with just two or three things. Monitor the chicken's ability to digest the food. If she poops soft but with bulk, this is good. Firm is best, but may take a few weeks to establish. If the chicken doesn't eat something, or gets diarrhea or constipation, don't give it again. Although, none of my chickens ever had a problem with any of the foods, except melon, as, it has a high water content.
You may also want to sprinkle a vitamin on her food (Vionate for Pets, is good), or you can administer a poultry vitamin like Nutri-Drench orally two to three days a week.
Without knowing what part of her gut is not working well, it's hard to suggest something to heal it. But adding echinacea herb to her diet would be good to improve her immune system. It can be added by sprinkling the powdered herb on food, or making a cup of tea and diluting it into 2 quarts of water. The addition of a good probiotic for poultry would also benefit her.
There are other experimental amino acids that may help, but you should try working on her diet first.
These are my thoughts on your chickens issue. I hope I have been helpful.
God Bless.