The mechanism of estrus after sow weaning: rapid dissolution and degeneration of the corpus luteum after weaning, follicles begin to develop, visible genital swelling begins after 3 days to 5 days, and mating can be completed within 1 to 2 days thereafter. After sow weaning is generally 3 days after weaning. 7 days can be natural estrus breeding.
Common causes of sows not estrus after weaning
1. Reasons related to feed. Some farms used sows with lower levels of vitamin A, vitamin E, vitamin B, folic acid and biotin, which often caused the sows to become estrus after weaning. Maize mycotoxins, especially zearalenone, have the greatest impact on the normal estrus of sows. After sows consume feed containing this toxin, normal endocrine function will be disrupted, leading to abnormal estrus or suppression of ovulation.
2. Environmental-related reasons. Temperature: During the hot summer months, the sow’s ovaries and estrus activity are suppressed when the ambient temperature reaches above 30°C. Light: The lack of light in the pigsty or daily light for more than 12 hours can inhibit estrus activity. Humidity: In the south, high-humidity seasons in March and April also have a greater effect on the re-estrus after sow weaning, especially in the first-fruiting sows.
3. The cause of gestational age. More than 80% of the estrous rate of sows with second-born or more (including second-born) sows within 7 days after weaning, and the estrus rate of weaning sows after weaning is often around 50%, and some sows do not have estrus. Months have even had to be eliminated.
4. Causes of reproductive disorders. Pathogenic factors such as swine fever, blue ear disease, pseudorabies, parvovirus disease, Japanese encephalitis virus disease, and Eperythrozoon are all factors that can cause sow complications and other reproductive disorders. In addition, sows with mastitis, endometritis, and adipocytosis had higher rates of estrus after weaning.
Measures to prevent sows from estrus after weaning
1. Early prevention.
(1) The sow’s own feed requirement for the lactation period is 2.5 kg/day, increase the feeding amount according to the number of piglets, increase the piglet weight by 0.25 kg/day per piglet, and do not excessively reduce the sow’s feed during the late lactation period. Quantity.
(2) Grasping the early feeding and feeding of suckling piglets to reduce nutrient consumption during sow feeding.
(3) The average group weaned from 21 days to 25 days. Weaned sows or delayed weaning can be appropriately advanced for individual sows according to their body condition.
(4) The patented product “King Mother†of Beijing Haizheng Xingchao can be added to sow feeding materials, which can effectively prevent the sows from estrus after weaning.
The main components of “Yimuwang†include daidzein, acid protease, digestive enzyme, estrus-inducing factor, placenta vitality, immunopolysaccharide, and metabolic activator. Its effects mainly include: regulating the endocrine of sows, promoting the secretion of female hormones in the gonads, enhancing the original libido of sows, promoting the ovulation of sows, reducing pseudopregnancy, and improving the pregnancy rate; shortening the estrus cycle of sows and promoting the estrus of weaned sows; Increase the average number of fetuses and the number of litters; significantly increase lactation sows' lactation and milk quality; significantly increase female litter size, survival rate, increase average litter weight and daily gain of newborn piglets; prevent sow miscarriage, stillbirth , and avoid the phenomenon of congenital malformation of piglets; significantly improve cell immunity, humoral immunity and non-specific immune function of the piglets.
2. Strengthen feeding management and provide normal nutrition for sows.
Provide the sow with full-quality, high-quality feed to ensure the normal nutritional supply of sows. Create a good living environment for the sow to ensure that temperature, humidity and light are suitable for the physiological needs of the sow.
3. Regular vaccination, prevention and treatment.
Do a good job in disease prevention and treatment related to reproductive disorders, inoculate a good vaccine, and do a good job in all non-communicable diseases such as metritis.
4. The following measures can be taken for sows that have not developed heat after weaning.
(1) Sows that are not estrus after 10 days after weaning can be injected intramuscularly with 3 ml to 4 ml of the triad hormone (triadin) or intramuscularly once at the gestational hormone level of 250 to 1000 units, chorionic villus Gonadal hormone 500 units, and then with the boar in the same sports field, usually 2 days to 4 days can be heat. However, the use of hormones may lead to the occurrence of estrous mating and unbornness, or to dependence on hormones. This has great side effects and caution is recommended.
(2) Supplement vitamin E, A, C, trace element selenium or feed green feed.
(3) Adjust body lice for over-fat and lean sows.
(4) Sows with reproductive disorders should be promptly treated or eliminated.
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