How to make good suckling pig feed? Detailed explanation of methods and techniques

The suckling pig feed I make is good in all other respects, but the coat and skin don't look good. Could an expert please give me some guidance!
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Many companies buy colorants
Red skin and shiny coat
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How about increasing the copper content a bit higher!
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Consider trace elements
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It's already very high, at 300PPM
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If you don't show your formula, even a miracle worker can't help you
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I suggest you show the formula, that way the cause can be found more accurately
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Add fermented soybean meal, red skin and shiny coat
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Use organic chromium combined with iron
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Could it be caused by high copper and high zinc!!!
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The coat and skin problem appears on the surface to be a deficiency or imbalance of minerals. In fact, it is poor digestion and absorption of nutrients, called sub-health. Compound enzyme preparations or probiotics both work well.
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Try adding some ferrous fumarate!!!!