Okay, now we are just going into the rice/corn issue. What we feed our cats these days is of much debate and I could go on for HOURS on different topics, but may take me 3 days
Rice and corn are both a carbohydrate which provide a source of starch. In dry pet foods a certain proportion of the diet must be made up of starch to allow proper expansion of the food pellets. During the process, the temperature increases the size of the starch granules and improves digesibility and taste. Dietary carbs provide a source of energy and helps in proper gastrointestinal tract function. You only run into problem if they are consuming more than they use. A good example of this is when you buy pet food with it's primary ingredient being corn or rice. It provides only a trace amount of protein as compared to a meat or egg white being the primary source. Which is why when you are looking for a food, you want to check the labels. Between Rice and corn, Rice has a digestability factor of .72 and corn is .54. IMO, either one is okay
