INRA-CIRAD-AFZ feed tables – https://www.feedtables.com/
Feedstuffs Ingredient Analysis Table 2016 edition – http://feedstuffs.farmcentric.com/mdfm/Feeess50/author/427/2015/11/Feedstuffs_RIBG_Ingredient_Analysis_Table_2016.pdf
Feedipedia – https://www.feedipedia.org/