When the sow gave birth for seven days, it was found that the nipples of the sow were cracked and some were a little rotten. I was given fish fat medicine, and now I haven't asked my friends for help for half a month. In addition to the sharp bite of the pig's teeth, there are two other reasons why some sow nipple skin will be brittle after sucking the nipple. 2. Lack of vitamins (especially Vd, Vb 12. Ve, etc. ) In order not to affect the lactation of piglets, you can apply cooked soybean oil to sow nipples from time to time, then add multivitamins and minerals to sow diet, and it is best to add some green feed (carrots are fed half-cooked).