Food
Science Diet Kitten Food has a protein content of 33% and is widely available at Veterinarians, most Pet Shops and some Farmers/Tractor Supply Stores.
Iams Kitten Food has a protein content of 34.8% and is widely available at most Pet Shops and wherever better quality Pet Foods are sold.
Eukanuba's Kitten food protein contents is about 36%. This food is largely available in Pet Stores.
Totally Ferret has a protein content of about 36%. This Food is available in Pet Stores. 
ZuPreem Ferret Food has a protien content of 40% and is available at a variety of Pet Stores.
Premium Ferret Diet is available at many stores and it has a protien content of 30%.
8 in 1 Ultimate food has a protein content of 38%.It is available in most Pet Stores as well as some Walmart Stores....
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Marshall Ferret and senior Ferret foods are available in different sizes as seen here.This food has a 38% protein content in the regular food and 34% in the senior food.It is available at most Pet Stores.
Kaytee Fiesta Ferret Food has a protein content of 30%and it is widely available at Walmart Stores as well as other Stores.
Kaytee Forti Ferret Diet is available at Walmart and several other stores. Kaytee has a 35% protein content.