Comprehensive measures to promote ovulation in sows

The purpose of rearing sows is to maintain a good body condition and good sexual performance, to achieve high fecundity, high utilization, access to a large number of weaned pigs, and improve production efficiency. Although the number of ovulations of sows is related to heredity, it depends on the feeding and management, the sow situation during weaning, the length of time the piglets have been suckled, and whether sows suffer from diseases of the reproductive tract, or when the breeding is timely or not.

1, to meet the nutritional needs

There is a big difference between the actual breeding ability and the potential breeding ability of sows, and the breeding management during the breeding preparation period is strengthened to provide a large quantity of high quality eggs, laying a solid foundation for high yield.

1 Short-term excellent feeding and adjustment of the lyrical state: The short-term superior feeding of empty sows prior to mating has the effect of promoting the ovulation of sows and the ease of conception. The method is about one week or two weeks before mating, adjust the waterlogging conditions properly, and maintain a reasonable body condition. As the saying goes, "empty sows have Bacheng lice, and it is easy to have a high birth rate." it is good. For normal sows, 2.0-2.2 kilograms of whole formula feed is fed daily; sows with poor body condition are provided with sufficient sow feed; for overweight sows, small amount of compound feed is given before and after weaning. , More feed green roughage, let it return to moderate sensation as soon as possible, to achieve early estrus ovulation and accept the purpose of mating.

2 Feed more green and juicy feed to meet the needs of calcium, phosphorus, vitamins, minerals, and trace elements: The method is to feed 5-7 kg of green or juicy feed per day or to supplement 25 g of bone meal.

3 Add antibiotics to the diet of weaned sows: Antibiotics can treat genitourinary infections such as metritis and vaginitis in weaned sows, and provide high levels of antibiotics from weaned to restocked sows can produce The rate of increase is 9%, and 0.2 piglets per litter can be added. There are many types of antibiotics on the market. The commonly used antibiotics are oxytetracycline 1,000 g/ton or 80% net 120 g amoxicillin 300 g aureomycin 400 g/ton. However, antibiotics do not play a role in the diet of pregnant sows.

4 Reasonable management: It is necessary to keep the pig house dry, clean and suitable for temperature and humidity. Maintaining a temperature of 12-15°C in general is beneficial to the estrus of sows. Fresh air, good exercise and light are also good for promoting ovulation in sows. It is recommended that daily lighting should be maintained for 10 hours, which is not appropriate and should not be less. In addition, group feeding empty sows can promote estrus, especially after the occurrence of estrus sows in the group, due to the stimulation of eclampsia and crawling, can induce other empty sows estrus, and at the same time easy for management personnel to find estrus sows, easy to use trials Boar try.

2, manage the newborn piglet

1 Controlling breast-feeding time: 7-day-old piglets start to feed, and when they reach the age of 18-25 days, piglets can feed a certain amount of feed, then they can control the suckling time of piglets every 6-8 hours. In 3-5 days, the sow can be in early estrus.

2 Piglet nesting: When pigs are released at the time of concentration in the pig farm, all the piglets produced by part of the littering sows can be fostered and fed to other sows, that is, the estrus can be quickly bred.

3 Weaned piglet early weaning: usually sows 5 to 7 days after weaning can be estrus mating, early weaning at the appropriate time, sows can be estrus mating in advance. However, a short period of lactation has a more serious consequence. It has an effect on the conception rate and the number of litters. A lactation of less than 10 days can cause a low rate of conception and a reduction in the number of litters by 1-2 heads. Therefore, based on the number of weaned piglets per sow per year, feed consumption of sows, and growth rate of piglets, it is more appropriate to wean piglets at 3-5 weeks of age on intensive farms.

3, to promote sow estrus

The non-estrus empty sow is incorporated into the circumscribing gilts and stimulates the ovulation of the empty sow by stimulating them. In addition, the massage of the breast can stimulate the ovulation of the sows. When a sow suffers from a disease, it should be diagnosed and treated promptly. Drug aphrodisiac: Injecting 100 IU of human chorionic gonadotropin (HCG) per 100 kg body weight or 1 mL of maternal serum (PMSG) to estrus mothers (800-1000 IU per head) to promote sow oestrus The effect of ovulation.

4, timely breeding

Mastering the timing of breeding is the key to breeding. The common method is to observe the static estrus for the first time (in the presence of boars) and delay the first mating for 12-24 hours, 8-12 after the first mating. Two hours later for a second mating. It is more important to ensure the quality of breeding than to emphasize the number of breedings. At the same time, the breeding season should ensure that the boar has a good body condition, and increase animal feed and green feed such as fishmeal and eggs to maintain a strong sexual desire and good semen quality in order to increase the conception rate; and to avoid excessive use and Abstinence.

What needs to be reminded is that during the hot season, measures must be taken to relieve heat stress in order to promote ovulation in sows. Because the weather is hot, the feed intake of the male and female pigs can be reduced by 50% to 75%. The nursing sows must catabolize their own energy, cause serious weightlessness, affect future breeding activities, and reduce the number of breast-feeding; A large number of embryos died, the estrus of the empty sows was delayed; the boar's sperm production capacity, sperm quality and quantity decreased, and the semen quality was poor, resulting in a drop in the conception rate. Therefore, we must do a good job in preventing heatstroke. Breeding and sports should be arranged in the morning and evening when it is cool or in the shade of the trees, avoid direct sunlight. Pigs should be fed with green feed, vitamin C drinking water, fresh fat, 0.2% sodium bicarbonate, and water sprays.