Six aspects of attention should be paid to the breeding of improved sows

1. The selection of retained sows must depend on the production performance of the previous generation of sows. The sows with the characteristics of this breed, strong body, large litter size, strong lactation ability, good litter care performance, high survival rate of piglets and strong feeding ability are selected. the specific requirements are as follows: the head and neck is light and elegant, the jaw is flat and no meat sag, and the head length is about 18-24% of the body length. If the head is big, the body is small or the head is small, most of them cannot be left as new sows. The forehead of the head should be wide (wide forehead, rapid development), the ear should be thin and the ear root is slightly hard, and the mouth tube should be neat. The eyes should be round, big, bright and bright. The neck should be of medium length and there should be no depression between the head and neck and between the neck and the torso.

2. When selecting a sow, it should be noted that the shape generally requires a wide body, a straight back, a wide and developed hindquarters, strong and slightly longer limbs, well-developed parts of the body, shiny coat, not fat or thin, more than 6 pairs of effective nipples, there is a certain interval between the nipples, and neatly arranged, no accessory nipples or dysplastic nipples.

3. Nipples are neatly arranged, the arrangement of two rows of nipples should be symmetrical or zigzag, there are no blind nipples, turned nipples or invalid nipples, and there should be at least several pairs of normally developed nipples according to the characteristics of the variety. At the same time, pay attention to the shape of the nipple, to choose "bubble milk", not "nail milk". The so-called bubble milk is to describe the shape of the nipple, such as Pao Tong (that is, Tongcao), long, large and obtuse; the so-called nail milk is to describe the nipple like an iron nail, the shape is shorter than the bubble milk, small and sharp. Especially the nipple before delivery and during lactation, the difference is more obvious. The milk mound of bubble milk is well-developed, the lactation machine can be good, the milk pool is enlarged, the milk is stored more, the nipple tube is thicker, and the milk is discharged quickly. Nail milk is the opposite. The difference between the two kinds of nipple suckling piglets was more obvious in the middle and later stage of sow lactation. The useful life of the selected sow is about 4 years, that is, it will be eliminated and renewed after giving birth to 7-8 babies.

4. On the basis of selecting the offspring of excellent boars and sows, pay attention to cultivate 2-3 piglets in a purposeful and planned way, fix the pre-selected piglets on 2-4 pairs of milk-rich nipples on the front side of the sows, and do a good job in disease prevention and treatment.

5. After weaning, new sows should gradually be fed with good green roughage. Feeding reserve sows with green roughage can exercise their gastrointestinal function and meet the needs of high fecundity and high lactation in adulthood. Leguminous forage contains estrogen, which can improve the fecundity of sows. Leguminous forage is the best forage for back-up sows. In order to ensure comprehensive nutrition, we should also mix properly with bran feed and supplement some protein feed such as cruller and fishmeal.

6. The new sow barn should pay attention to setting up a playground to allow it to exercise more, so as to enhance the metabolic function of sows. Ensure that the pig house is clean and dry, disinfect regularly, change frequently and sun mat grass frequently. Regular deworming and preventive injections are carried out.