First, breeding pigs should be eliminated in the breeding farm include the following situations:
1. A gilt older than 8 months old does not have estrus.
2. Weaned sows have no estrus during the two love periods (42 days) or 2 months.
3. The sow has two consecutive, cumulative three habitual abortions during pregnancy.
4. The sow relapsed more than twice after mating.
5. The first and second live litters of young sows have less than 7 litters.
6. The total number of litters per month of live piglets for all three production sows is less than seven.
7. The sows whose sows produce two consecutive births and the cumulative three-factured suckling piglets have a survival rate of less than 60%, as well as sows with poor lactating ability, biting, and often difficult labor.
8. More than seven parity sows and cumulative live births less than nine.
9. Reserve boars older than 10 months old cannot be used.
10. The boars were ineligible for two consecutive months of semen testing (questionable weekly fines 1).
11. Reserve pigs have congenital genital diseases.
12. Breeding pigs with common diseases that cannot be recovered after two consecutive treatments.
13. Breeding pigs with severe infectious diseases.
14. Breeding pigs that have lost use value due to other reasons.
Second, the requirements to eliminate pigs:
1. Strictly abide by the elimination criteria
2. Planned and balanced phase-out in weeks/months
3. On-site control and verification, it is best to test each batch of weaned pigs once
4. Maintain reasonable sow age and gestational age structure
III. Breeding program
1. The annual elimination rate of sows is 25-33%, and the annual elimination rate of boars is 40-50%.
2. Pre-use culling rate of replacement pigs: 10% culling rate of sows and 20% culling rate of boars.
IV. Backup pig introduction plan
1. Old field: The number of pigs introduced in the reserve year = the passing rate of reserve pigs for the elimination of basic adult pigs for several years.
2. New Field: Redeployment pig number = base adult pig number. Or gilt introduction number = Full-load production Weekly Planned breeding sows for 20 weeks.
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