First, the reasons for the return of love after mating
1. If the sow returned to her condition within 20 days of breeding (18-19 days), it would be too late.
2. If the sow returned to her condition after 22 days of mating (23-24 days), then the mating is too early.
3, if 21 days, 22 days, 23 days after mating return to love, indicating that the failure of mating, then you need to fully consider whether the sow has the condition, the quality of sperm is eligible and other issues.
4. If you return to love within 39-45 days after mating, it means that you missed the previous estrus cycle and you need to check the method of return detection.
5, if the return within 25-38 days after mating, outside the normal range. A sow who is pregnant but unable to conceive may be due to stress, moldy feed, too few eggs for pregnancy, or uterine infection.
6, if the sow returned to love after 45 days after mating, outside the normal range. Sows who are pregnant but unable to conceive can think of miscarriage, moldy feed, disease, stress or fight.
7, if returned in 3-18 days, it may be: ovarian cysts, uterine infection, moldy feed disrupted the normal reproductive cycle.
Second, the reasons for the long-term lack of sows
The number of non-pregnant and non-mammalized days for any production sow and replacement pig that exceeds the appropriate age (usually set at 230 days) is referred to as Non-Productive Vitamin E Days (NPD). There are 3-6 days of weaning to breeding intervals required, during which sows are prepared for estrus and can be called non-productive days.
Causes of non-productive days of sows
1, gilts over 230 days old, no estrus performance or short estrus time, oestrus is not obvious cause leakage, or due to nutritional discomfort, lack of essential vitamins, trace elements and improper management, the lack of heterosexual stimulation and the right amount of exercise Delayed the initial allocation time; pigs kept fat, resulting in non-estrus pigs, etc. will increase the number of non-production days of gilts.
2, weaned sows, due to good sensation, can not be heat within 3-7 days after weaning.
3. Sows who are infertile during a love period and who have delayed the return time will have an increase in non-productive days.
4. Aborted sows that have not been estrus for a long time, or estrus mating and not pregnant sows.
5, pregnant sows died during pregnancy, or because of disease eliminated sows. The sows that should have been eliminated had failed to be processed in time, which prolonged the feeding time and increased the number of breeding days for sows.
6, pregnancy miscarriage of justice. After 18-21 days of pregnancy test, the pregnant sows did not produce the result of misjudgment, and the sow had no estrus performance. Long-term sow rearing increased the number of non-productive days of sows.
Third, the cause of sows not estrus
For non-estrus sows, first check the medical history to see if any diseases related to reproductive disorders have occurred, such as parvovirus, Japanese encephalitis, blue ear disease, pseudorabies, chlamydia disease, brucellosis, and swine fever.
In addition, the light has a certain influence on the estrus of pigs. Pigs that are not estrus in dark-light houses can be transferred to the outdoors to promote their estrus. For those who have not been in heat for 70 consecutive days, they are mostly organic diseases and should be eliminated in time.
Fourth, the sow's regrowth, long-term empty, estrus feeding management measures
1. Check the sow with the boar about 21 days after the breeding, and make a pregnancy diagnosis every month.
2. Pregnancy-tested empty empathetic pigs were placed in the observation area and reconstituted in time. Pregnancies empty pigs into the breeding area to re-establish the sow card.
3, feed about 3 kilograms per head per day, feed 2 times a day. Too much fat to adjust the amount of feed, sensation back to normal and re-equip.
4. The sow with empty and abnormal estrus should be kept in a centralized manner. Every day, the boar should be placed in the bar for 10 minutes or placed in a mixed group of male and female sports. Observe the situation of estrus.
5. Healthy and normal estrus-free sows should first adopt comprehensive measures for feeding and management (see Methods for Inducing Emotions), and then use hormone therapy.
6. Exogenous sex hormones such as PG600, hematogenin, chorionic gonadotropin, ovulating hormone, cloprostenol, etc. can be used symptomatically in sows that are not estrus or have repeated infertility.
7, long-term sick or empty more than 2 periods of time should be eliminated in time.
JB Metalluraical Application Cylinder
Wuxi ASK Pneumatic Machinery Co.,Ltd , https://www.askpneumtic.com