The fertility of the sow directly determines the economic benefits of the pig industry. It is affected not only by hereditary factors but also by environmental factors. The pig is a multi-fetal animal and has a high reproductive potential. The following measures can improve the fertility of the sow. .
Pay attention to selection. The gilts were selected and stayed for one month before mating, combined with the reproductive performance of the family, selected to keep the body development well-proportioned, coats sparse, many teats and no abnormalities, nipples and vulva large and normal, while requiring open hind legs. It is best to keep the sows with two rows of nipples spaced apart and having more than three nipples in front of the umbilicus. Sows with over 7 litters should be eliminated.
Reasonably arrange breeding season. The sows are best to be bred in spring from April to May, and from August to September; from September to October, they are to be bred again; the larvae will be bred in January-February next year; the breeding will be carried out again in February-March and the litters will be born in June-July. Repeated cycle, so that sows in the spring and autumn breeding more litter.
Keep body condition. If the sow is too obese, it should control the lyrics, otherwise it will affect fertility, and 7-80% fleas should be appropriate to strengthen the exercise; sows with poor body condition, especially sows, 10-15 days before mating, Feed 1 to 1.5 kilograms per day while feeding more feed rich in vitamins and minerals. This can ovulate multiple eggs and arrange eggs, which plays a decisive role in improving the fertilization rate and promoting the development of eggs.
Timely breeding. For sow breeds, local sows should be bred 2 to 3 days after estrus. Cross-breeding sows and breeding sows should be bred on the afternoon of the second day after estrus. For the sow’s age, it should be , with less late, not many with the middle of the principle of breeding.
Sows are kept during pregnancy. After sows are pregnant, they should master the principle of "two fine, medium thick" feeding. During the whole period of pregnancy, sufficient green and juicy feed and mineral feed should be fed. About 20 days after the sow is pregnant, the nutrients needed are high. Therefore, care should be given to the rearing of the sow; one month before the sow’s production, on the one hand, the fetus’s body weight increases rapidly and requires a lot of nutrients. On the other hand, As the size of the uterus expands and the digestive organs are squeezed, the feed intake of the pigs is likely to be insufficient, and nutrient-rich feeds should be fed.
Do a good job of health and epidemic prevention. The high temperature season has a great influence on the sow's conception. When the ambient temperature exceeds 30°C, the stillbirth and the weaker one obviously increase. Therefore, the pig house should be kept cool in winter and cool in summer and clean. Management must be careful to prevent mechanical abortion. If there is a precursor to miscarriage, progesterone should be injected promptly. In addition to regular annual epidemic prevention of swine fever, erysipelas, piglet pasteurous triple vaccine, swine foot-and-mouth disease vaccine, etc., 2 to 3 weeks before maternal primiparous sows can be injected with inactivated parvovirus vaccine, after every six months Once immunized; Sows can be injected with JE vaccine before mating, repeated once every 2 weeks, once a year thereafter; pregnant sows injected with pseudorabies-reproductive disease syndrome-parvovirus triple vaccine one month before delivery .
Pay attention to selection. The gilts were selected and stayed for one month before mating, combined with the reproductive performance of the family, selected to keep the body development well-proportioned, coats sparse, many teats and no abnormalities, nipples and vulva large and normal, while requiring open hind legs. It is best to keep the sows with two rows of nipples spaced apart and having more than three nipples in front of the umbilicus. Sows with over 7 litters should be eliminated.
Reasonably arrange breeding season. The sows are best to be bred in spring from April to May, and from August to September; from September to October, they are to be bred again; the larvae will be bred in January-February next year; the breeding will be carried out again in February-March and the litters will be born in June-July. Repeated cycle, so that sows in the spring and autumn breeding more litter.
Keep body condition. If the sow is too obese, it should control the lyrics, otherwise it will affect fertility, and 7-80% fleas should be appropriate to strengthen the exercise; sows with poor body condition, especially sows, 10-15 days before mating, Feed 1 to 1.5 kilograms per day while feeding more feed rich in vitamins and minerals. This can ovulate multiple eggs and arrange eggs, which plays a decisive role in improving the fertilization rate and promoting the development of eggs.
Timely breeding. For sow breeds, local sows should be bred 2 to 3 days after estrus. Cross-breeding sows and breeding sows should be bred on the afternoon of the second day after estrus. For the sow’s age, it should be , with less late, not many with the middle of the principle of breeding.
Sows are kept during pregnancy. After sows are pregnant, they should master the principle of "two fine, medium thick" feeding. During the whole period of pregnancy, sufficient green and juicy feed and mineral feed should be fed. About 20 days after the sow is pregnant, the nutrients needed are high. Therefore, care should be given to the rearing of the sow; one month before the sow’s production, on the one hand, the fetus’s body weight increases rapidly and requires a lot of nutrients. On the other hand, As the size of the uterus expands and the digestive organs are squeezed, the feed intake of the pigs is likely to be insufficient, and nutrient-rich feeds should be fed.
Do a good job of health and epidemic prevention. The high temperature season has a great influence on the sow's conception. When the ambient temperature exceeds 30°C, the stillbirth and the weaker one obviously increase. Therefore, the pig house should be kept cool in winter and cool in summer and clean. Management must be careful to prevent mechanical abortion. If there is a precursor to miscarriage, progesterone should be injected promptly. In addition to regular annual epidemic prevention of swine fever, erysipelas, piglet pasteurous triple vaccine, swine foot-and-mouth disease vaccine, etc., 2 to 3 weeks before maternal primiparous sows can be injected with inactivated parvovirus vaccine, after every six months Once immunized; Sows can be injected with JE vaccine before mating, repeated once every 2 weeks, once a year thereafter; pregnant sows injected with pseudorabies-reproductive disease syndrome-parvovirus triple vaccine one month before delivery .
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