1. Adjust gestational age structure
In general, the reproductive performance of 3-6 fetuses is in the best period. In order to ensure the reproductive performance of the herds, the sow should be maintained at about 60% of the gestational age, and the first child and the 2nd sow should be 30%. -35%, more than 7 children are 5%-10%.
2. Select gilts
The gilts were selected and stayed for one month prior to breeding. The selected sows should have a clear-cut head, good eyes, good motherhood, smooth shoulders, wide and deep chest, wide straight back and long back, and wide rear buttock. The muscles are full, the limbs are of moderate thickness, strong and strong, posture is correct, and the body is well-balanced. The nipples developed normally with more than 6 pairs of effective nipples, neatly arranged, moderately slender and short, with equal distance and obvious features. The fur is sparse, short and shiny, and the whole body is smooth and elastic. After selection, the rearing should be properly restricted, sows should not be over-fat or too thin. Feeding should be started two weeks before breeding to reach 2.0-2.5 kg per day. The crude protein content in feed should reach about 16%, and at the same time, sufficient minerals should be ensured. Substances, vitamins.
3. Select the timing of weaning
To prevent the development of mastitis, sows should be gradually reduced to about 2 kg per day three days before weaning. However, after weaning, in order to promote the estrus of the sow and increase the number of ovulation, high-quality feed should be used, and the amount of feed can be given to 2.3-2.6 kilograms per day according to the public opinion.
4 do a good job during pregnancy
(1) Sows are generally bred twice. From the second day of the second breeding to three weeks after the breeding, low-energy, low-protein diets should be supplied, and the daily feeding amount is 1.5-2.0 kg. Otherwise, it will affect the secretion of progesterone due to too much feed intake, increase embryonic death and reduce the number of litters.
(2) From the fourth week to the 80th day of pregnancy, low-energy, low-protein diets should be continued, but daily feeds should be increased by 0.3-0.5 kg compared to the pre-pregnancy period to 1.8-2.3 kg per day. Sows must be guaranteed at this stage. Appropriate lyricism is generally best controlled to the United States 5 grade 2.5-3. If it is not easy to grasp, do “nice to lose weight†because overfeeding during pregnancy can lead to anorexia during breastfeeding, and arrhythmia or too much weight loss, affecting the fertility of the second trimester.
(3) From the 80th day of pregnancy to the farrowing, in order to ensure the rapid growth of the fetus and increase the birth weight and health of the piglets, sows at this stage should be fed with high-energy and high-protein feeds, and the daily feeding amount is generally 2.3-2.8. kg. Sows are dewormed two weeks before delivery, disinfected for one week before delivery, and transferred to a farrowing house.
5. Breastfeeding
High-energy, high-protein diets should be fed during lactation. The amount of feed should be 1.8-2.3 kg for the first 3 days after farrowing, and increase by 0.5 kg per day from the fourth day until free food intake.
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