1. Intramuscular parvovirus vaccine 1 month before mating.
2. Two or three injections of swine fever and swine erysipelas were used before the breeding of the animals (or a triple vaccine with the addition of swine plague) and 4 times the intramuscular injection.
3. Every spring (from March to April), intramuscular injection of Japanese encephalitis vaccine once.
4. Inoculate 1 pseudorabies vaccine 1 month before mating.
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