The boars used in large-scale pig farms are generally used for 3 years, and annual replacement rates should be 30% to 40%. Renewed boars are derived from reserve pigs that have been measured as superior or superior from professional breeding farms. The disabled boars, poor semen quality, brutal wounding, and boars over the age of 4 should be eliminated in time, so as to increase the aquaculture production on the pig farm and realize the efficiency of the breeding. The elimination of breeding boars should be performed according to the following standards:

1. Boars with low sperm motility are eliminated.

2. Offspring has dark spots and boars are eliminated.

3. Boars with severe leg problems are eliminated.

4. Poor libido eliminated.

5. Offensive boars are eliminated.

6. Regular sperm sampling tests positive for the major reproductive disorder pathogens and eliminated boars that do not meet health requirements.

7. Unsatisfactory detection of swine fever antibody. Re-examination is still unqualified.

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