1. Under normal circumstances, the sow may give birth in about 2 hours after the nipple in front of the abdomen appears thick milk, in about 1 hours when the middle nipple squeezes milk, and in 3 ~ 6 hours when the rear nipple squeezes milk.
2. When the sow is near delivery, it usually shows itself in the form of holding grass and paving the nest of the pig bed. If there is no grass in the fence, it has to be expressed by scratching the ground with its hoof. 24 hours before delivery, the sow shows anxiety, frequently urinating, grinding her teeth, wagging her tail, arching the ground, lying down from time to time, and constantly changing her posture. When giving birth, we usually lie on our side and choose the quietest time to give birth, usually after 4 pm, especially at night.
Third, the more accurate way to cut off the farrowing time of sows is to squeeze a lot of milk when you gently press any nipple of sows, which means that sows will give birth soon. If you give birth for the first time, you need to isolate the cub from the sow. You should put the cub next to the sow every day only when you are feeding, and someone should take care of it. When you are feeding, you will rub the cub's mouth in front of the sow's nipple a few times, and the cub will take the initiative to suck. After feeding, you should isolate the cub from the sow, and put the cub with the sow again for about one week.
extended information
suckling cubs
① heat preservation and pressure prevention. Suitable temperature for suckling piglets: 31.8 ~ 28.3℃ for 1 ~ 7 days, 27.7 ~ 23.5℃ for 8 ~ 35 days, 18.3 ~ 22.1℃ for indoor temperature and 49.7% ~ 7.4% for relative humidity, so as to keep the air fresh. Piglets should be equipped with an incubator or an incubator, and a 25-watt infrared light bulb should be hung at the bottom of the incubator or 3 ~ 4 cm away from the bottom of the incubator. At the same time, do a good job in piglet care, and install a baby protection fence in the delivery fence.
② eat colostrum and fix nipples. Piglets should eat enough colostrum artificially within 1 hour after birth. The nipple should be fixed within 2 ~ 3 days after birth. Fixing nipples is mainly based on self-selection, supplemented by individual adjustment. Piglets with small birth weight are fixed in the front nipple and piglets with large birth weight are fixed in the back nipple.
(3) Iron supplementation and litter replacement. Within 2 ~ 3 days after birth, piglets were injected with iron preparation intramuscularly, with a dose of 1 ~ 15 mg of iron per pig. Lactating sows feed 1 ~ 12 piglets each. For piglets with more than 12 litters or less than 7 litters, the overfeeded piglets are fed to sows with less litters and no more than 3 days difference in delivery time. Piglets must eat enough colostrum before overfeeding. For sows with too few farrowing, two litters of piglets can be combined into one litter according to the principle of farrowing, and one litter will be in good health. Sows with sufficient milk are fed. Piglets must eat enough colostrum before nesting.
Reference: Baidu Encyclopedia Pig