I’m a bit confused about what exactly you’re looking to find out. By “where do chicken by-products come from?” are you wondering what part of the chicken, what country, what particular farms?
If you’re looking to learn more about what exactly chicken by-products (and other commonly used) pet food ingredients are, I’d urge you to check out the following links:
The Truth About Pet Food Ingredients Part I
http://truthaboutpetfood2.com/learn-the-truth-about-pet-food-ingredients
The Truth About Pet Food Ingredients Part II
http://truthaboutpetfood2.com/learn-the-truth-about-pet-food-ingredients-part-2
The Truth About Pet Food Ingredients Part III
http://truthaboutpetfood2.com/learn-the-truth-about-pet-food-ingredients-part-3
Chicken By-Products are discussed in Part I.
