Under normal circumstances, the farrowing rate will decline after the sows have produced eight litters of piglets, and sows with low farrowing rates should be eliminated. Some sows have some abnormalities during the breeding period and should be eliminated as soon as possible.
The first is sows that have acquired viral infections such as swine fever and pseudorabies. Even if a sow who has acquired such an infectious disease is cured, it will likely relapse at the next birth and will be transmitted to piglets. To avoid greater economic losses, such sows must be eliminated early.
The second is sows suffering from mastitis and metritis. The ability of these sows to suckling piglets has decreased significantly, and the milking power has decreased, which must be eliminated in advance.
The third is a sow with defective limbs. For example, legging sows will not only affect the breeding of the sows, but also due to the lack of regular activities, physical constitution is not good, even if the production of piglets, piglets will not be healthy, should be eliminated in advance.
The fourth is that under normal feeding conditions, sows with slow growth rate should also be eliminated.
The fifth species is a sow that is difficult to breed. Even if drugs are used to promote their estrus, but the next breeding will be difficult, easy to empty, causing economic losses. In addition, some sows are affected by hereditary factors, and the birth rate is very low. Only three or four piglets per litter should be eliminated in time.
The first is sows that have acquired viral infections such as swine fever and pseudorabies. Even if a sow who has acquired such an infectious disease is cured, it will likely relapse at the next birth and will be transmitted to piglets. To avoid greater economic losses, such sows must be eliminated early.
The second is sows suffering from mastitis and metritis. The ability of these sows to suckling piglets has decreased significantly, and the milking power has decreased, which must be eliminated in advance.
The third is a sow with defective limbs. For example, legging sows will not only affect the breeding of the sows, but also due to the lack of regular activities, physical constitution is not good, even if the production of piglets, piglets will not be healthy, should be eliminated in advance.
The fourth is that under normal feeding conditions, sows with slow growth rate should also be eliminated.
The fifth species is a sow that is difficult to breed. Even if drugs are used to promote their estrus, but the next breeding will be difficult, easy to empty, causing economic losses. In addition, some sows are affected by hereditary factors, and the birth rate is very low. Only three or four piglets per litter should be eliminated in time.
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