Pregnancy during sow mating has been a headache for most farmers. After years of practice with farmers, it has been found that using sow urine to verify pregnancy is a simple and reliable method for farmers.
Fifteen milliliters of fresh urine from the sow morning 8-10 hours were taken and placed in a transparent glass bottle. Drop a few drops of vinegar or a small amount of iodine into a glass bottle filled with urine. Place the glass bottle on a small fire and gradually warm it until the urine boils. Observe the color of the urine to determine if the sow is pregnant. If the urine is red, the sow is pregnant. If the urine is light yellow or brown green, and the color disappears immediately after cooling, the sow is not pregnant.

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