Calculate the relevant data for the elimination and update of breeding pigs
Take 100 basic sows as an example, the farm delivery index is 2.3, calculated as follows:
Boar: Under natural mating conditions, the ratio of normal male to female should not exceed 1:20, then 100 basic sows need boars to be 10020=5 heads. The number of updates per year is 52 = 2.5 headers (ie, 2 or 3 headers per year).
Sows: According to an effective life cycle of 8 fetuses, with an average annual output of 2.3 fetuses per sow, the average service life of the sows is 82.3 = 3.48 ≈ 3.5 years. The annual elimination rate was 13.5100%=28.6%≈30%.
The number of farms for 100 basic sows should be eliminated and the number of renewal should be 10030% = 30. The number of heads to be eliminated and renewed per month is 3012 = 2.5 (if a large-scale pig farm is used, the head of each week should be eliminated and updated. number).
Update according to the general principle of breeding out pigs
The above data are theoretically calculated values. The actual operation should be based on the following principles to eliminate and update breeding pigs.
The principle of elimination of sows: First, the elimination of age and weight have reached the breeding standards, but continue to raise 2 to 3 estrus after estrus estrus. Second, eliminate sows that are not estrus after 60 days after weaning. 3. Weed out sows that have returned 3 to 4 times continuously. 4. Weed out sows with less than 6 consecutive childbirths or fewer stillbirths and poor or poorly-divided sows. 5. Weeding out less than 6 pairs of nipples, abnormal development, sows with inverted titers or sucking tits or deputy nipples, and poor milking ability. 6. Weed out the sows with poor motherhood, viciousness, and low rate of rearing. 7. Weed out sows that are slow to eat, overweight and overweight, slow-moving, dull skin, and have no eyes. VIII. Elimination of sows with deformed offspring. Nine, eliminate sows that have diseases or disabilities, older age, and decreased performance.
The elimination principle of boars is generally eliminated based on the age of use, but boars that are bulky, poor in semen quality, poor in mating performance, and violent in temperament should be eliminated in time.
After the elimination of vacancies, they should be filled with ideal spare breeders at any time.
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