The first type of "school" should be a sow who has acquired a viral infection. For example, swine fever, pseudorabies, and sows who have acquired this type of infectious disease are cured after the use of drugs, and are likely to relapse at the next birth and will be transmitted to piglets. In order to avoid further economic losses, sows should not Hesitate to have such sows "off the class."
The second is that there has been inflammation of the udder, uterine inflammation, breastfeeding piglets decreased significantly, the milking power must be reduced. If you think about it, you have a big litter of pigs but you are not able to feed it. Such a mother must be incompetent. It is best to rush to resign.
The third kind of "student" should be a sow with a defective body. For example, a sow who is lame will not only affect the breeding of the sow, but because she cannot exercise regularly, her constitution will not be good, even if the pig is born. Piglets are also not healthy.
The fourth kind of “class†should be breeding sows that are difficult to successfully use, that is, the use of drugs to promote it to heat, but generally there will be difficulties when the next breeding, it is easy to cause empty, not reproduce, resulting in economic losses. Such a sow can't stay seeded. It's best to let it be "off the class" as early as possible.
In addition, some sows are genetically affected and have low birth rates, producing only three or four piglets per woman. Such sows are also incompetent and should be allowed to “school outâ€.
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