Wash the fresh livestock tires with clean water, cut them into small pieces, dry them in the sun, place them on the tiles and dry them with micro-fire, and then ground them into powder. When the amount is large, the powder may be finely grounded by using a pulverizer to store bags. , Serve fetal powder. Usage: Mix fetal clothing powder into feed to feed livestock. If before mating, take 20-40 grams of fetal clothing mix into the feed, fed 2-4 times a week, sows can promote estrus after eating, boar can increase libido after eating and increase the number of sperm. Often feeding pregnant sows with birth-placental powder can also help the development and growth of the fetus in the abdomen. In addition, feeding young and frail animals with fetal clothing during the cold season can improve cold resistance.