请帮助翻译

Amino acids and digestible amino acids mainly refer to the database, and the raw materials may vary from person to person.
In the late pregnancy, the amino acids of the feed are calculated based on 85% of the lactating period. It is unknown whether it can meet the nutritional needs of heavy pregnant sows.
There are no major issues with the structural aspect, but it is necessary to explore whether the use of several raw materials is necessary:
a. The national standard for organic chromium only allows a maximum of 0.2mg/kg to be added in the feed for growing and fattening pigs. Can it be added to the sow feed?
b. Our GC3000 multi-mine already contains inorganic selenium, and the full-price feed reaches 0.3mg/kg. Will it be more effective to increase it to 0.4mg/kg?
c. Does the lactating sow feed require an acidifier? What are the effects? Will it affect feed palatability?
d. Our GC3000 multi-mine already contains inorganic zinc, and the full-price feed has reached the national maximum limit, so it cannot be added anymore.
e. Is it necessary to add yeast cell walls?
5. Please provide standards for selecting raw materials, especially for corn and wheat bran.
6. When should the lactating sow feed begin to be used? Two days before delivery, the day of delivery, or three days after delivery? How much should be used?