Weaned piglets not only have underdeveloped digestive system, but also underdeveloped immune system, which leads to the immune blank period of weaned piglets. Before weaning, although the immune system of piglets has not been fully developed, there are a large number of maternal antibodies in the milk of sows, and a large number of globulin can provide effective protection for piglets. After weaning, the source of maternal antibody is suddenly interrupted, and the piglets themselves have no immunity and the immune organs are not well developed, so the immunity of piglets is low at this stage.
Generally, after weaning, the stress period of weaning will last about 15 days. Even if we artificially use drug intervention to solve the problem of weaning stress, the stress will generally last for seven to ten days. Under normal circumstances, it is suggested that farmers should be vaccinated about ten days after weaning, and it takes about ten days after vaccination to produce effective antibodies. So weaned piglets have an immune blank period of nearly 20 days.
In the immune blank period, if bacteria or viruses invade, weaned piglets will hardly produce effective resistance, and will not produce interferon and antibodies to resist the invasion of viruses or bacteria at all. So at this stage, he is prone to some serious bacterial infections, viral infections and mixed infections, such as blue ear disease, ringworm disease, Haemophilus parasuis infection, streptococcus infection and other diseases. Once the disease occurs, the immune system of piglets will be further damaged, the body resistance will be seriously reduced, and the overall situation will deteriorate.
Immune blank is caused by the imperfect development of immune organs in piglets. In order to make piglets pass the immune blank period safely, it is necessary to use drugs for human intervention to help weaned piglets enhance their resistance. Worry-free meals can be used to protect piglets. Worry-free meals can promote the development of liver, spleen and other organs, enhance the function of immune system, improve the immunity of piglets, and spend the immune blank period.
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