The whole process of sow production from sow production from the first production of piglets to the birthplace discharge of sows is referred to as the birth process. Normal sows' normal labor time is about 2-3 hours. However, in pig production practice, due to a variety of factors that lead to a long production process, an increase in the rate of stillbirth has caused significant economic losses to pig production.
First, the cause of long sow production process
1. Breeding too early
Precocious mating of early sows results in prolonged delivery time due to the development and dysfunction of the endocrine and reproductive systems.
2. Sow obesity
Sows are over-fertilized, lack of exercise, and weak uterine contractions during farrowing, resulting in prolonged delivery.
3. Parity effect
In older sows older than 8 months, some of them are fatigued late in the farrowing period, uterine contractions and abdominal pressure are weakened, and the labor process often delays to more than 10 hours. In addition, the number of calving sows in old sows has become less and less, the birth weight has become smaller and smaller, and the economic benefits have been reduced.
4. Variety factors
Several lean-type sows, such as Yorkshire, Duroc, Changbai and Pietrain, imported from abroad, and sows newly bred in China are approximately 1-2 hours longer than the local sows. This may be due to their adaptation. Sex related.
5. Various stress factors
Most sows are stressful and sensitive when they are farrowing, and if they are combined with heat stress and cold stress, they will aggravate their nervous state. They will be panic-stricken, stand unsteady, and have prolonged labor.
6. Infection and reproductive disorders
When a sow is infected with reproductive disorders such as Japanese encephalitis, parvovirus, or pseudorabies, the fetus dies in the belly of the sow during the second or third trimester of pregnancy and often produces a dead fetus or mummy wrapped in decayed tires for several hours. . Some labors last 3-4 days or even longer.
7. Excessive fetus
Some pregnant sows fed too much fat, fetus growth and development, resulting in laborious sows, prolonged labor.
8. Breeding time is too long
The young sows have a strong libido and the duration of estrus lasts 3 to 5 days. Some sows begin to receive breeding and breeding, because they are not falling, and some are compounded for 2 to 3 days, due to the long time for reconstitution. The labor process has also been slightly extended.
Second, the solution
1. Sows should not be too early and too early, which will not only make the production process too long, but also have lower viability and survival. Therefore, the breeding age of sows should be 8-10 months of age is appropriate, weight should be more than 120 kilograms, sows after 2-3 seasons after the appropriate breeding.
2. Double mating for each estrus of the sow is a measure to increase the conception rate and the number of litters, but it is advisable to use two to eight hours for the breeding interval (preferably one in the morning and one in the day).
3. The nutrition of pregnant sows should be sufficient and balanced (using sow professional health products---No.1, adding 0.8-1% in 80-114 days of the later period of pregnancy), but the feeding should not be much, especially in late pregnancy. Hey, it is better to make the sow reach a medium sensation.
4. Combining with the actual local conditions, formulate scientific immunization procedures to effectively prevent and control the occurrence of common reproductive disorders in sows. For those who have already contracted the disease and started to deliver stillbirths, chlorprostinil injection with 2-4 ml of oxytocin can accelerate the discharge of stillbirths.
5. When the sow is littering, it is necessary to create a comfortable, quiet, clean, air-flowing, temperature-appropriate environment to prevent all kinds of stress.
6. Sows in the late parturition, physical exertion, fatigue and inability to give birth, with a 10% glucose injection intravenously 500-1000 ml. At the same time with pituitrin 10-50 units, intramuscular injection. Both can elicit production, as well as the timely discharge of stillbirths, births, and accelerate the recovery of the uterus and prolactin effect. Slaughtered sows with poor fertility should be eliminated in time.
7. The most scientific method is to use high-pressure flushing to give birth: the specific method is to inject a 0.1% potassium permanganate solution into the sow's birth canal by using a high-pressure water gun (adjusted to 2-3 large pressures) when the sow begins to give birth. When a certain amount of water volume and pressure are reached, the sows can quickly produce a litter, usually within 2 hours, and greatly reduce the incidence of postpartum diseases in sows. Prevent the feeding of moldy feeds and large doses, long-term use of de-moulding agents.
In summary, there are many reasons for the long production process of sows. Therefore, increasing contraction power and increasing sow physical strength are the starting points for solving the problem. Changing the sow feeding method, increasing the amount of exercise, and changing the constitution is the fundamental way out.
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