Read the label the best products avoid the use of grains like corn or wheat, soy and animal by-products.
(1)Any commercial pet food where the major ingredient is grain is bad. Mother Nature doesn't feed dogs and cats that way; why should you?" Primary ingredients should be chicken, turkey or fish instead of by-products and grains (such as corn, wheat or soy).
(2)This is an area of controversy and there are no clear-cut answers as to whether to feed products containing them because the quality and quantity can vary with each company and batch of food. By-products do include some very nutritious items but they also contain organs that have been deemed "unfit for human consumption" and this is where personal reluctance enters into my decision to feed a food without by-products. Organs that show signs of disease such as cancer or infection are 're-routed' from the human meat market to the pet food market. The fact that cats eat by-products in the wild cannot be disputed, but the by-products consumed fresh 'on the hoof' are not the same as those that have been designated as unfit for human consumption so the two situations are not entirely comparable.
(3)Grains
soy, corn, corn gluten and wheat gluten are often used as protein sources; however, they are generally inferior and difficult to digest.
(4) Natural Salt is an essential element in the diet of not only humans but of animals, and even of many plants. I use sea salt.
(5)There have been no studies done to determine the effects of longterm buildup of preservatives. Even so, use of preservatives in human food has become a concern and has translated to pet food. Based on customer concerns, the best cat foods have switched to Vitamins C or E as preservatives rather than artificial components. If you decide to avoid artificial preservatives, check the label. Some common names of these chemicals include BHA/BHT, ethoxyquin and propyl gallate.
I will continue not to feed my chickens cat food, but please read the label. Our chickens are for consumption and not as pets so I am very careful as to what I feed them. I don't have much faith in the medical profession, I have been involved in nutrition, natural health, finess, herbs and alternative medicines all my life. Look at what is happening in America today, people are overweight, illnesses and cancer is skyrocketing and with all these miricle pills on the market, do I trust the pharmacutial companys and doctors, NO. Good Luck