How to make suckling pig feed well

I do suckling pig feed, the other is good, but the fur is not good-looking, please give me some advice! -there are a lot of units that buy colorants that are red and bright.-the copper content is higher! -consider the trace elements.-it's high, it's 300 ppm.-if you don't show your formula, the immortals can't help you.-I suggest you show it. Only in this way can we more accurately find out the reason-adding fermented soybean meal with bright red skin and bright hair-organic chromium and iron is not caused by high copper and high zinc! The surface of the fur problem is a lack or imbalance of minerals. In fact, it is indigestion and absorption of nutrients, called sub-health. Compound enzyme preparations or probiotics are easy to use. -try adding some ferrous fumarate!