Thank you for your question. I forwarded it on to our in-house veterinary staff, and this is the response they sent me:
The chicken used in our dry cat and dog foods comes from the United States, from USDA/APHIS certified suppliers. It is not organic, but these chickens are not fed any growth hormones. The chicken used is the muscle tissue (from the breast, thighs, etc) and does not include parts such as necks, beaks and feet. These are considered by-products and are not included in our food.
Our veterinarians have visited the facility where our food is manufactured, on multiple occasions. Our manufacturer follows excellent quality control procedures before, during and after the manufacturing of each lot of food, including strict sanitation procedures as well as testing for harmful microorganisms. Our food is also tested to make sure it contains the amounts of nutrients stated in the Guaranteed Analysis on the label.
Our foods are intended for cats over 1 year. While it is possible that an Adult Cat food may be adequate for some kittens, these diets are designed for the amino acid, calcium, and phosphorus needs of adult cats. When feeding kittens, we recommend using a food specifically designed for kittens. Look for a diet that carries an AAFCO statement saying it meets the nutritional needs for growth of cats. For older kittens, beyond 3 or 4 months of age, it would be fine to add some variety with a small amount of canned adult cat food, as long as a Kitten food makes up most of the diet until the kitten is about a year old.