First, strengthen the breeding and management of sows before breeding. For gilts within 10 to 14 days prior to mating, the sows are fed with a diet enriched with protein and vitamins before supplementing the seeds, supplementing minerals and trace elements, and increasing the amount of time required for outside exercise and sunbathing. Rejuvenate and promote early estrus, ovulation and mating. Second, weaned pigs were weaned early. Early weaning of suckling piglets is beneficial to raising the number of litters per year and the number of litters per year. The time of early weaning should be 3 weeks old on farms with excellent feeding and management conditions, and should not be later than 6 weeks old on average farms. Third, to promote ovulation in sows. 1. Induction of estrus: The male and female pigs are raised in mixed circles to stimulate sow estrus through the stimulation of pheromones released by boars and males and females. 2. Breast massage: After feeding each morning, repeat the front and back surface massage on both sides of each row of breasts for 10 minutes. After the estrus of the sow, change to the surface massage for 5 minutes. Then squeeze around each breast with 5 fingers. Do deep massage for 5 minutes; on the morning of mating, massage deep for 10 minutes to promote ovulation. 3. Chinese and Western medicine aphrodisiac: (1) pregnant horse serum. 60-120 days pregnant gestational serum was taken and injected subcutaneously once a day for 2-3 days. The first 5-10 ml, the second 10-15 ml, and the third 15-25 ml. Temporary horse whole blood can also be collected temporarily for intramuscular injection [J.com/]. Usually estrus can be 3-5 days after the injection. (2) Human chorionic gonadotropin. Medium-sized sows weighing 75-100 kg, once intramuscular injection 500-1000 units. With the use of pregnant horse serum, the effect is better. (3) Anterior pituitary gonadotropin. Before the arrival of each sow in the sow. For 1-2 days, one intramuscular injection of 500 units of the hormone was used for 2 days for a soothing effect on sows aphrodisiac and ovulation induction. (4) Chinese herbal formula. Angelica, Xiangfu, tangerine peel each 15 grams, Chuanxiong, Angelica, Rehmannia, Fennel, 12 grams each Odontoside, 100 ml white wine, decoction, 2 times a day orally, each time plus 25 ml of white wine. (5) Use 25% hypertonic glucose solution 30 ml, add penicillin 1 million units, enter the uterus for half an hour and then mating, for sows with metritis or vaginitis, the effect is particularly good. Fourth, estrus sow timely breeding. 1. Initial age: Generally speaking, the initial age of gilts, local breeds are 6-8 months old after birth, and the body weight is more than 50 kilograms; the introduced species are 8-10 months old after birth, weighing 90 kg The above is more appropriate. 2. Breeding time: The appropriate breeding time should be 22-34 hours or 20-32 hours after the start of the estrus estrus. The technicians press the sow's back or buttocks by hand, or try to cross the sow with the trial boar. Sows Staying still, it is suitable for breeding. The sow breeding time is greatly influenced by the age. Generally, the old sows can be bred on the day of estrus. The middle-aged sows are bred on the second day after estrus. The gilts are suitable for breeding on the third day after estrus. The so-called "old with early, small with late, not old with small." The sow breeding time varies among different breeds. The adaptation time for different varieties of sows is: 2-3 days after the occurrence of heat in China's local breeds, and on the second day after the estrus is developed, the hybrid pigs are in the afternoon on the second day to the third day after the heat. 3. Breeding methods: (1) First-time sows can be bred with the same boar for 2-3 times, with an interval of 8-12 hours. (2) For sows, the same boar can be used to breed twice, twice at intervals of 8-24 hours. In this way, during the entire ovulation period of the sow, the viable sperm is kept in the fallopian tube, so that the eggs that have been discharged in the ovary can be fertilized. (3) Commodity hogs can be double-matched, that is, sows used two boars in one estrus period, with 10 to 15 minutes at a time, each with one. This way, the sows can have more litters, piglets are well-developed, and have a strong life force. Fifth, to prevent the death and miscarriage of pregnant sows. 1. Feed a nutritious full price feed, feed no frozen feed or ice water, feed no toxic feed, and do not suddenly change feed to prevent nutritive abortion. 2. Prevent the sow from infectious or parasitic diseases (such as swine fever, swine erysipelas, brucellosis, Japanese encephalitis, phlegm, etc.) and cause infectious abortion. Vaseline Gauze,Vaseline Gauze Pads,Vaseline Coated Gauze,Sterile Vaseline Gauze Henan Anbang Medical Supplies Co., Ltd. , https://www.anbangmedical.com