After 4-6 years of sow use, production performance will gradually decline and new sows must be renewed, selected, and reared. The following six aspects should be taken into consideration when selecting and breeding new sows.
When selecting sows to stay, attention should be paid to the general appearance of the body, which requires a large body, a straight back, a wide and well-developed hindquarters, and strong and long limbs. Each part of the body is well-balanced, with hairiness, no fat or thin, and 6 pairs of effective nipples. Above, there is a certain interval between the nipples and they are arranged neatly, with no nipples or dysplastic nipples.
The nipples are arranged neatly, and the arrangement of the two rows of nipples should be symmetrical or in the shape of a product. There should be no nipple nipples, inverted nipples, or invalid nipples. There should be at least several pairs of normal nipples according to breed characteristics. At the same time, we must also pay attention to the shape of the nipple. We must choose “bubble through milk†and not “nail milkâ€. The so-called bubble milk, is to describe the shape of the nipple such as bubble through (ie through the grass), long shape, large and blunt; the so-called nail milk, is described as a nipple like a nail, the shape of the bubble than the short milk, small and pointed. In particular, nipples before and during lactation are more distinct. The bubble milk milk mound is well-developed and has a good milking function; the milk pool is enlarged and has more milk storage; the nipple tube is thicker and the milk is faster. Nail milk is the opposite. The difference between the two types of nipple suckling piglets was more pronounced in the mid-and late-stage lactation of sows. The number of sows to be selected for use lasts for about 4 years, that is, they will be eliminated after 7-8 births.
To select sows, you must look at the performance of the previous generation of sows. Select the sows that meet the characteristics of this breed, have a strong body, have many litters, have strong lactation, have good nursery performance, and have high piglet survival rate and strong feed intake. The specific requirements are: the head and neck are light and handsome, and the lower jaw is flat and free. The meat is about 18-24% of its body length. If the head is small or small, it can't be kept as a new sow. The forehead of the head should be wide (the forehead is wide and develops quickly). The ear should be thin and the ear root should be slightly stiff. The mouthpiece should be flush. Eyes are round, big, bright and godlike. The neck should have a medium length, head and neck and neck and trunk should be well connected without depression.
Based on the selection of good male and female pigs, pay attention to the purposeful and planned cultivation of 2-3 piglets in the lactation period, and fix the preselected piglets on the front side of the sows with 2-4 pairs of milky nipples. Have a baby and do a good job of preventing and treating diseases.
The new sow pens should pay attention to the establishment of a sports field, allowing them to exercise more to enhance the sow's metabolism. Ensure that the pig house is clean and dry, regularly sterilized, and change frequently and diligently. Insecticide and injections are given regularly.
After weaning new sows, we should gradually use good green roughage as the main feed. Feeding gilts with green roughage can exercise their gastrointestinal function, and they can adapt to the needs of high fertility and high milking power after reaching adulthood. Legume grasses contain estrogen and can increase the fertility of the sow. The green roughage fed to the gilt is best for legumes. In order to ensure comprehensive nutrition, it is also necessary to properly mix bran feeds and supplement certain protein meals such as oil cakes and fishmeal.
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