What causes sows not to come into heat? Many people get the correct order of estrus induction wrong
Causes of sows not coming into heat and the normal order of estrus induction, most people get it wrong
Estrus is an important indicator of whether a sow is healthy or not.
If a sow comes into heat normally, it shows that the sow is healthy. If a sow reaches the time for estrus but does not show estrus symptoms, it means there is a problem with that sow.
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Below, let's discuss the causes of sows not coming into heat:
There are many causes of sows not coming into heat. Most are improper feeding and management, inflammation of the reproductive organs, or abnormalities of the reproductive organs.
The specific causes are as follows:
Excessive mycotoxins. Mycotoxins are called the underlying disease of pig farms. In the 2006 high fever disease, mycotoxins played the role of an accomplice and were also an important trigger. When the moisture content in feed is 17% to 18% and the ambient temperature is 25°C to 30°C, and when the integrity of grain particles is damaged, mycotoxins are more likely to be produced.
Excessive weight loss during lactation, more than 15 kg, insufficient protein intake, and the sow being too thin. The sex hormones in the sow's body have not returned to normal levels, which will affect the reproductive performance of the sow in the next litter or several litters. Being too fat, with too much fat in and around the ovaries, causes follicular atrophy or cysts, which is not conducive to follicle development and affects ovulation, thereby causing failure to come into heat.
High-temperature heat stress in summer affects the endocrine system and ovarian function.
⟧Persistent corpus luteum or inflammation of the uterus causes false pregnancy, preventing the body from secreting prostaglandin, which leads to sows not coming into heat.
Congenital causes, malformation of the reproductive organs. For mild cases,treatmentmeasures may be taken; for severe cases, culling should be done as early as possible.
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Specifictreatmentmeasures: measures: specifictreatmentmeasures:
Generally, first use a boar to mount the sow, or change pens, or increase lighting, or use the semen of a sterile boar. For large replacement gilts, after various methods have failed, bumpy stimulation therapy may be used. For those with moderate or below-moderate body condition, brown sugar may be used together fortreatment. When all the above methods are ineffective, hormone therapy may be used.
The specific operating details are as follows:
1. Use a boar to stimulate the sow. Because sows are sensitive to the boar's smell, calls, and mounting, use a boar with strong libido to chase a sow that has not come into heat for a long time, 5 minutes each time is enough. Let the sow frequently contact the boar. Through the boar's mounting, stimulate the sow to secrete estrogen, causing estrus and ovulation.
2. Put 750 grams of brown sugar into a clean iron pot, heat it over fire until it is scorched, add 3 jin of water and boil for 15 minutes, then feed it in three days, once a day. Generally, estrus occurs in 3 to 5 days, and the conception rate is very high. This formula is suitable for sows with moderate or below-moderate body condition.
3. Change pens. Move a sow that has not come into heat for a long time to a new pen, or put it together with a sow that is currently in estrus, and use the mounting stimulation of the sow in the same pen to stimulate estrus and ovulation.
4. Starvation therapy. After starving for two days, feed normally again, but sufficient drinking water must be provided.
5. Increasing lighting time effectively promotes estrus. Never neglect sunlight. Sunlight can promote the normal development of sexual function and promote the absorption of vitamin E. If conditions permit, let them bask in the sun more.
6. Spray the semen of a sterile boar onto the sow's nose. Use natural physiological hormones to promote estrus in sows.
7. Bumpy stimulation. For heavy replacement pigs, use a disinfected vehicle to run back and forth on a dirt road for 5 to 8 km, which can effectively promote estrus in sows.
When the above methods are ineffective, PG600, estrus-inducing powder, etc. may be used for treatment.
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Preventive measures: measures::
When replacement gilts are 6 to 7 months old, occasionally drive a boar to the sow pen for stimulation. This is very helpful for estrus in replacement gilts. Each time should not exceed five minutes.
Control mycotoxins well. Raw materials should be checked.
Strive to make replacement gilts weigh more than 270 jin. Mate at more than seven and a half months, and do not mate too early.
Adjust the sow structure. Keeping the proportion of first-litter sows at about 15% can greatly reduce second-litter syndrome.
In summer, cooling measures may be taken, such as installing water curtains, strengthening ventilation, and so on.
For long-term failure to come into heat caused by diseases such as purulent endometritis, or for replacement gilts that still have not been mated 10 months after birth, culling may be considered.
Sows in poor body condition may be weaned early. In summer, 2% vegetable oil may be added to sow feed, which can reduce sows being too thin at weaning.
The purpose of writing this article is to tell everyone that when a sow fails to come into heat, it should be handled reasonably according to the situation, and every effort should be made to achieve natural estrus in the sow.
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