1, gilts over 8 months of age are not estrus.
2. Weaned sows have no estrus during the two love periods (42 days) or 2 months.
3, the second consecutive sow, cumulative three habitual abortion during pregnancy.
4. The recurrence of sows after mating is more than two consecutive times.
5. The first and second live piglets of young sows have 7 or less live piglets.
6. The total number of live piglets that have been produced by the production sows is less than 7 for three productions.
7. The sows that have passed the second parity of production and the cumulative three-producing suckling pigs have a survival rate of less than 60%, and the sows whose poor lactation ability, biting, and often dystocia.
8, more than 7 times of sows by birth and the cumulative number of live births is less than 9 heads.
9. Reserve boars over 10 months old cannot be used.
10. The boars were not qualified for two consecutive months of semen examinations (questionable weekly fines 1).
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