How to mix black guinea pig feed by hand? A practical plan shared

Three plans for manually mixing feed during black guinea pig farming:
Plan One
Cornmeal 67%, wheat bran 11%, soybean meal 18%, premix 4%.
Plan Two
Cornmeal 30%, wheat bran 20%, soybean meal 15%, rice bran 33%, salt 0.5%, one small packet of trace elements (Tusu Zhang), 2 tubes of multivitamins, 200 g Astragalus polysaccharides (a Chinese patent medicine, with no side effects, to improve body immunity).
Plan Three
Cornmeal 35%, wheat bran 30%, soybean meal 15%, rice bran 20%, one small bottle of multivitamin elements, 25-50 VC tablets, 150 g salt, 100 g-250 g garlic, a small amount of Astragalus polysaccharides.
Article source: Black Guinea Pig Farming Exchange Group. The above formulas are for reference only; readers should judge their feasibility for themselves.