The purpose of management during this period is mainly to: improve sow body condition, make it normal estrus, discharge good quality eggs, achieve timely breeding, increase estrus conception rate and number of embryos conceived, shorten the birth interval, and increase each sow The number of litters per year. 1. Reasons for not having estrus after childbirth: Low feed intake during lactation (due to long-term energy, inadequate protein intake, or too much weight loss during lactation, resulting in sows becoming thin, ribs exposed, and pale skin. Solution: Add 5 to feed 6% of vegetable oil) or overweight (overweight fat in the ovaries and surrounding the sow is not conducive to follicular development); excess of the corpus luteum but not estrus; early mating age; lack of vitamin A, vitamin E, protein Waiting instead of estrus; diseases: such as metritis, ovarian cysts (to make the uterus can not produce enough prostaglandins, resulting in the corpus luteum can not be regressed, available luteinizing hormone release hormone 100-300 micrograms intramuscularly, once daily, once every 2-4 days) Long-lasting corpus luteum (prostaglandin available 2 mg/day for 2 consecutive occasions), blue-ear disease, pseudorabies, swine fever, parvovirus; environmental factors such as too high or too low temperature and lack of daylighting; feeding moldy deteriorating feed. Management should carefully observe and inspect all the transferred sows. The sick pigs (meteoritis, fever, food, and fat) should be treated promptly; the pig should be carefully observed for estrus. 2. Feeding program: Adult weaned sows are fed lactating sows and fed twice a day. On the weaning day: feed 1–2 kg per day and feed 2–2.5 kg on the second day until estrus. The sows with poor body condition are bred for 2 weeks before the start of the breeding period to estrus for estrus, and are fed 2.5-3.2 kg of feed daily or are free to feed. 3. Aphrodisiac method: (1) Use a boar to tease: Every morning and afternoon, drive the boar away along the sow's head corridor, or drive the boar into the sow herd and chase the sow for 20 minutes. The opposite sex stimulates and climbs the stimulation to promote the estrus of the sow. At this time, someone needs to take care of it. (2) Grouping, adjusting circle, merging, and moderate exercise outside the house: Mix the pigs in different laps together and increase the light, preferably 4-6 per lap; prolonging the light can promote the development of reproductive organs and sexual maturation. Early; the estrus-free sow was raised in the same circle as the estrus sow and caused sexual excitement through the climb of the estrus. Giving gilts 16 hours of light and 8 hours of darkness each day can significantly reduce sexual maturation, accelerate follicle development and maturation, increase ovulation, and promote fertilized egg implantation and embryonic cell division. (3) Massage breasts: 10 minutes of surface massage (promoting estrus) and 5 minutes of deep massage (promoting sows ovulation) on non-estrus sows per day. (4) Adjust body condition: According to the sow's body fat condition, increase or decrease the full-price feed appropriately (for the sow with thin condition after weaning, wait until the second estrus match, the number of litters will increase ). (5) Vitamins (E, A, D3) and minerals (selenium) are added to the feed or vitamin C is supplemented with fresh green feed. (6) Hormonal aphrodisiac: When sows are weaned, they are injected with 800-1000 units of PMSG, or 100 units of human chorionic gonadotropin (HCG), and induction of estrus using PG600 is better. When all measures are ineffective, they should be eliminated immediately to reduce economic losses.
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