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Check the sow pregnancy new law
Take 10 ml of urine from the sow in the morning, place it in a transparent glass (urine can not be too concentrated, if it is too strong, add some water), add a few drops of vinegar, and then drop a small amount of iodine solution on a small fire. Heat slowly. When the urine is boiled, if the urine appears red, it indicates that it is pregnant; if the urine appears pale yellow or brown green, and the color disappears quickly after cooling, it is not pregnant.