With the adjustment of rural industrial structure and the development of social economy, more and more large-scale pig farms in rural areas, the emergence of these large-scale pig farms has greatly enriched the vegetable baskets of urban and rural residents and also solved the employment of surplus rural labor. The roads were provided, which also increased the income of the farmers and drove the local scientific pig raising level. These pig farms generally use fine varieties at home and abroad. This has also played a leading role in the improvement of local varieties. However, there are also some misunderstandings in the introduction of pig clocks and cross breeding.

I. Selection criteria

Breeding of pig breeds is based on the following criteria: (1) growth rate of pigs (sows up to 100 kg body weight) and feed utilization (feed ratio); (2) pig carcass quality (slaughter rate) (3) Breeding production capacity (sexuality, litter size, birth, milking power, weaning weight, annual reproductive fetal tree, boar sexual desire, sperm count and quality, frequency of use, etc.) (4) The health and growth status of breeding pigs; (5) Environment and market adaptability. Breeding pigs that meet these criteria are the real thoroughbreds.

Second, a reasonable choice of species

Under normal circumstances, the introduction of foreign varieties such as Changbai, Dabai, Du Luo Ke, Ke, Hampshire, Pietrain and other varieties, the production performance is better. These exotic species have been cultivated through long-term artificial breeding. They have been widely introduced around the world because of their high growth rate, low feed-to-meat ratio, high slaughter rate, high lean meat ratio, and high economical efficiency of culture. However, some local breeds in China, such as Taihu pigs, have early sexual maturity, obvious signs of estrus, a large number of litters, strong lactating capacity, delicious meat, good maternal feeding, strong resistance to feeding, strong resistance to stress, and strong environmental adaptability. These are exactly what foreign varieties can't match. Therefore, according to the need to properly choose breeds.

III. Introduce science and strengthen identification

The status quo of some breeder farms in China is as follows: they are politicians, they are not ventilated, they lack information exchange, they lack international market surveys, and some are introduced by non-professionals. The purchased products are often intermediate products of breeding programs, that is, uncross-breeding hybrids. Or hybrids of the line. In addition, the lack of monitoring of the epidemic resulted in the invasion of PSE, DFD (pale, soft, water-permeable, dark-black, hard, dry) genetic breeding pigs, and PRRS (blue ear disease). At the same time, in some breeding farms, due to the small number of basic groups of breeding pigs, no external blood is introduced for a long time, which inevitably results in close relatives breeding. There are no professional breeding talents and no systematic scientific breeding programs. Some farms do not even have an important aspect of breeding pig identification.

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