Feed formula

For beginners, please advise whether the formula of lactation sow feed is reasonable: corn 670KG/T, soybean meal 320KG/T, wheat bran 50KG/T, compound premix 40KG hand T.Mel-rich. Don't you think the soybean meal is a little high? It's just a standard formula with no technical content-- it should be recommended by the premix manufacturer, right? Not enough energy, and easy to constipation, it is recommended to add 20 kilograms of oil, the amount of soybean meal is reduced, the amount of wheat bran is added. In addition, during the lactation period, it is good to add some green feed to the sows under the current solar terms. Pay attention to the purpose of the formula, 1. Health 2. Cost-you are too rich!-if the raw material is single, the feeding effect may not be good! -- Soybean meal is too high, it is recommended to change some DDGS, corn can be replaced with expanded-- the raw material is too simple Protein raw materials can be used with soybean meal at a lower price-20kg fat is recommended-DDGS is not palatable, and some germ meal and a small amount of fish meal can be used. The grease is good. What kind of variety? 6 @ 6 ^ 9} 3c (x $h "N0N)? 7} 3F! J-e0 Et reduces soybean meal?