Breeding pigs are the basis for the proliferation of pigs and are the core of the entire pig production. Since the use of breeding pigs has a finite number of years, natural boars usually do not exceed 2 years, sows do not exceed 8 children, harvested boars use 3 to 4 years, sows do not exceed 8 and sow production performance big difference. Therefore, only by implementing a scientific and reasonable breeding and renewal system for breeding pigs can we stabilize or increase the production level of breeding pigs and achieve the purpose of improving the economic efficiency of the farm. So, how to eliminate and renew breeders?
Calculate the relevant data for the elimination and update of breeding pigs
Take 100 basic sows as an example, the farmyard tiller index of 2.3 is calculated as follows:
Boar: Under normal mating conditions, the ratio of common sows to sows should not exceed 1:20. 100 basic sows need boars to be 10020=5. The number of updates per year is 52 = 2.5 headers (ie, 2 or 3 headers per year).
Sows: 8 breedings according to an effective life cycle. The annual average of the sow's lifetime 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 is the theoretical calculation of the actual operation of the breeding pig should be eliminated and updated in accordance with the following principles.
The principle of eliminating sows:
First, the gilts that have not reached estrus following the elimination of age and weight that have reached the breeding standards but continue to breed for 2 to 3 love periods.
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: Boars that are generally eliminated on the basis of their useful life, but boars, bulky semen, poor semen quality, unsatisfactory mating performance, and ferocious temperament should be eliminated in time.
After the elimination of the absence should always make up with the ideal reserve breeding pigs.
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