First, gilt retention and feeding management
1. Selection points for gilts
The gilts not only have a considerable genetic impact on the offspring piglets, but also have an important influence on the growth and development of the piglets during the embryonic and lactation periods, and also affect the production costs of the offspring piglets. The selection of gilts should consider the following points:
1) For the selection of gilts, generally 60 kg body weight is appropriate, more than 6 pairs of effective nipples, uniform size, good development of the genitals, strong limbs, and mild temperament.
2) The gilts were free to feed before 60 kilograms, 60 kilograms were properly controlled afterwards, and the gilts were fed, so that the gilts weighed 120-140 kilograms at 7 to 8 months of age.
2. Health measures for gilts before mating
1) In order to increase the ovulation rate of sows, high nutrient feeds should be fed for aphrodisiac at 10 to 14 days prior to breeding, and be fed with broad-spectrum antibiotics (such as bacteriophage, reticulum) or intramuscular injection of Deli first. The pathogenic microorganisms in pigs are purified and the litter size can be increased.
2) The gilts were dewormed 15 days prior to their mating, and 500 g of 1000-pound material was fed with Dino Nuo 500-kg feed for 7 days to lay a good foundation for successful gestation sows.
3. Initial breeding of gilts.
1) The initial allocation time is 8 months old and the weight is 120-140 kg. If the breeding time is too early and the weight is too light, the number of litters will be reduced, the milk production will be low, the interval from weaning to estrus will be prolonged, and the breeding life of sows will even be shortened.
2) It is generally considered that when the estrus is bred on the 2nd and the 3rd day after sexual maturity, the first estrus should not be bred. The pregnancy rate is low and the litter size is reduced.
3) Breeding times: two breedings, the first respec- tive breeding with press reflexes, and one reconstitution after several hours.
Second, pregnant sows feeding and management
1. Due to individual differences, the sow's food intake is different, so mating sows should be raised in a single circle and given to the diet.
2. The sows should be restricted in feeding at the beginning of pregnancy so that the embryos can be implanted smoothly. The amount of feed for the primiparous sows is controlled to be less than 2.1 kilograms and 1.8 kilograms for the sows. Some studies have confirmed that limited feeding can improve the survival rate of embryos and increase the number of litters of sows; during the second trimester, the sow's feed intake can be controlled within the range of 2.0 to 2.5 kg depending on the body's different body conditions; Increased to 2.8 to 3.5 kg, but we must pay attention to prevent difficult sows due to excessive sows and postpartum feed intake.
3. The management of pregnant sows is mainly to do a good job of preventing miscarriage, preventing miscarriage and reducing early embryonic death. Pregnant sows should be raised on a single lap to avoid biting and crowding; do not whip, startle and catch up, do not exercise on the smooth ground, walking, to prevent falling, causing mechanical abortion. Keep enough water. Pigs should pay attention to ventilation, keep the air fresh, winter should pay attention to cold insulation, summer should pay attention to heatstroke, do a good job in pig house clean and prevent the epidemic.
4. Pregnancy sows 15 days prior to the use of imperial insect repellent, 500 grams of mixed feed 1000 pounds, and even fed 7 days. Before entering the delivery room, Weikang was used to clean and disinfect the delivery room. Prenatal and postpartum postpartum use of slow-breathing or reconciliation can effectively control postpartum diseases in sows. The last 3 days before delivery, the amount of sows to be fed is gradually reduced, and an appropriate amount of laxative is added.
Third, feeding and management of lactating sows
The feeding and management goals of nursing sows are: to maximize feed intake and increase milk production; to reduce the loss of weight during lactation; to promptly promote heat and reduce the rate of return.
1. The sow should prevent overfeeding two days before childbirth, gradually increase the intake from the third day, and increase the daily intake of at least 0.5 kg; about a week to resume free feeding. High-energy, high-protein feed formulas are fed to lactating sows (eg, S416).
2. The delivery room temperature should be controlled at about 25°C, and maintain the appropriate humidity; regular ventilation, keep the air clean.
3. The sow postpartum intramuscular injection of Deli first to prevent the occurrence of postpartum diseases.
4. During the lactation period, appropriate amounts of fat (such as soybean oil and extruded full-fat soybeans) in the feed can increase milk yield, milk fat percentage, increase piglet survival rate and weaning weight, prevent weight loss of sows, and promote estrus. But pay attention to prevent fatty acid from failing.
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