Strengthen sow breeding and management before mating. For gilts 10 to 14 days before mating, the sows are fed a diet rich in protein and vitamins before supplementing the seeds, supplementing minerals and trace elements, and increasing the time required for outside exercise and sunbathing. Rejuvenate and promote early estrus, ovulation and mating.
Suckling piglets 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.
Promote ovulation in sows. 1. Induction of estrus: The male and female pigs were raised in mixed circles to stimulate estrus by means of the pheromone released by the boar and the climbing stimulation of male and female pigs. 2. Breast massage: After feeding each morning, repeat the facial massage on both sides of each row of breasts for 10 minutes. After sow estrus, change to surface massage for 5 minutes. Then squeeze with 5 fingers around each breast. 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 to 120 days of pregnancy pregnant horse serum, subcutaneous injection, once daily, once every 2 to 3 days, the first 5 to 10 ml, the second 10 to 15 ml, the third 15 to 25 ml. Temporary horse whole blood can also be collected temporarily for intramuscular injection. Generally 3 to 5 days after the injection can be heat. (2) Human chorionic gonadotropin. Medium-sized sows weighing 75 to 100 kg, once intramuscular injection of 500 to 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. 1 to 2 days, 1 intramuscular injection of 500 units of the hormone, used for 2 days, the sow aphrodisiac and promote ovulation effect. (4) Chinese herbal formula. Angelica, Xiangfu, tangerine peel each 15 grams, Chuanxiong, Angelica, Rehmannia, Fennel, 12 grams each Chinese acacia, 100 ml of white wine, after decoction, 2 times a day orally, each 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.
The estrus sows are mated at the right time. 1. Initial age: Generally speaking, the initial age of the gilt, the local breed is 6-8 months after birth, and the body weight is more than 50 kg; the introduced variety is 8-10 months after birth and the body weight is 90 kg. The above is more appropriate. 2. Matching time: The appropriate breeding time should be 22 to 34 hours or 20 to 32 hours after the start of sow estrus. Technicians should press the sow's back or buttocks with the hand or try to cross the sow with the test boar. 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 breeding time of sows differs among different breeds. The adapting time of sows of different breeds is: 2 to 3 days after the occurrence of estrus in Chinese local breeds, 2 days after estrus in estrus, and after estrus in hybrid pigs. 2 days afternoon to 3 days morning. 3. Breeding methods: (1) First-time sows can use the same boar to mate 2 to 3 times, each time interval is 8 to 12 hours. (2) Through the production of sows, the same boar can be used to breed 2 times. The interval between the two is 8 to 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, the sow used two boars in one estrus period, which are followed by 10 to 15 minutes, each with one. This way, the sows can have more litters, piglets are well-developed, and have a strong life force.
Preventing sow embryo death and miscarriage in pregnant sows. 1. Feed a nutritious full-priced feed, not feed frozen feed or drinking ice water, feed feed that contains toxic substances, 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 contagious abortion.
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