First, to strengthen the breeding management of sows before breeding Seed sows in the 10 to 14 days before mating, the production of sows in the re-equiped before feeding, feed rich in protein, vitamin feed, make up minerals and trace elements, appropriate Increased outdoor exercise and sunbathing times can increase rejuvenation and promote early estrus, ovulation, and mating.
Second, early weaned suckling piglet weaned piglets early weaning, to improve the number of litters per litter and annual litter size is favorable. 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 the ovulation of sows 1. Induction of estrus: The male and female pigs are raised in mixed circles, and the sex hormone released by the boar and the climbing stimulation of the male and female pigs promote the estrus of the sow. 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 kilograms were given intramuscular injections of 500 to 1,000 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, once every 2 days, has a significant effect on aphrodisiac and ovulation induction. (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.
Fourth, estrus sows timely breeding 1. Initial match age: Generally speaking, the initial maturation age of gilts, local breeds for 6 to 8 months after birth, weighing more than 50 kilograms; introduced species for the postnatal 8 to 10 Moon age, weighing more than 90 kg is more appropriate. 2. Matching time: The appropriate breeding time should be 22~34 hours or 20~32 hours after the start of sow estrus. Technicians should 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 of different varieties of sows is: 2 to 3 days after the occurrence of heat in Chinese local breeds, and 2 days after the occurrence of heat in the breeds, the hybrid pigs are in the afternoon from the afternoon of the 2nd day to the 3rd day after the heat. 3. Breeding methods: (1) First-born sows can use the same boar to mate 2~3 times, each time interval is 8~12 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) The commercial hog can be double-matched, ie the sow used two boars in one estrus period, with intervals of 10 to 15 minutes and one for each. This way, the sows can have more litters, piglets are well-developed, and have a strong life force.
Fifth, to prevent pregnancy sow embryo death and miscarriage 1. Feed nutrient-rich full-priced feed, do not feed frozen feed or drinking ice water, do not feed toxic feed, do not suddenly change the feed to prevent nutritional abortion. 2. To prevent mechanical agitation (such as fighting pigs, kicking pigs, catching rushes, fighting for food, crowding, biting frames, etc.) to cause damaging abortions. 3. Prevent the sow from infectious or parasitic diseases (such as swine fever, swine erysipelas, brucellosis, Japanese encephalitis, phlegm, etc.) and cause contagious abortion. 4. Prevention of sow mistreatment (such as injection of dexamethasone) caused drug-induced miscarriage.
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