When sourcing pig feed premix, you must focus on the nutrient concentration and bioavailability. Ensure the premix contains a balanced profile of essential vitamins (A, D3, E, K3, and B-complex), trace minerals (Copper, Iron, Zinc, Manganese, Iodine, and Selenium), and essential amino acids like Lysine and Methionine. The carrier material should be non-GMO corn flour or calcium carbonate to ensure stability and prevent caking. Always verify the inclusion rate (typically 1%, 4%, or 5%) to calculate the final feed cost accurately.