First, the main reason for not being pregnant
1. The main reasons for 21 days of returning after mating: (1) inflammation (vagina, uterus, or fallopian tube). (2) Mating prematurely or lately. (3) Overuse of boars. (4) The boar is too young or too old. (5) boar infection or malnutrition. (6) Hot and cold stressed bite fighting, transfer to groups and other stress high-energy feed, mildew feed.
2. The main reason for returning after 25 days of mating: It is mainly 14 to 40 days after mating, and the embryos are absorbed after they die. Mainly due to reproductive disorders. If fetal bones die after being formed, they can become mummies and stay in the uterus for a long time, leading to long-term estrus in sows.
3. Reasons for breeding: (1) Check the quality of semen every week. If the conditions are not available, observe the outflow of jelly fluid from the boar after mating. Normal white, semen, gray, yellow and red. (2) Insufficient experience of cultivators can use compound double repeats. (3) Avoid high temperatures and cold, reduce boar stress. (4) The boar cannot be assigned within one month after high fever. (5) Disinfect and clean the male and female genitalia before mating. (6) Breeding of boar nutrition in the mating season to prevent food from feeding deteriorating feed.
Second, the reason why gilts are not estrus
1. Congenital genital dysplasia.
2. The house does not circulate air.
3. Feed quality is poor, single, moldy, or lack of crude fiber or fattening pig feed is too long (over 75 kg).
4. Over-fat causes follicular epithelial steatosis, and atrophy of the follicles is not estrus. Excessive lean effects on normal physiological development are also not estrus.
5. Over-closed breeding, not receiving boars and external stimuli.
Remedy: (1) Select more desirable descendants of the parent. (2) Appearance Select the standard required for the sow. (3) To create a suitable living environment for pigs. (4) Feed 75 kg of lactating sow material, 100 kg of quantitative feed, and give full fiber feed. (5) After 100 kg, try to meet various contact with the outside world (the same sex movement).
Third, the cause of sows not having estrus after milk (20 days after weaning)
1. Early mating months are premature (less than 7 months and 110 kg).
2. Malnutrizing sows (especially raising more than 10 or weaning too late).
3. Illness and weight loss during lactation.
4. If the ventilation is not smooth in the summer, the sows will eat less and lose weight.
5. Some sows were timid and thin because of herds squabbling on shelves.
6. Long holding yellow body.
7. Owing to the chronic pain and stress caused by limb and foot disease, ovarian function is inhibited. Sows can't stand and lead to missing.
8. Missing allocation accounts for the actual proportion due to implicit estrus.
Solutions: (1) Early weaning. (2) Do not mate prematurely (120 kg). (3) Improve nursing sow nutrition. (4) Sows were fed with antibiotics and postpartum intramuscular injection needles before and after each week of littering. (5) Weaning for 21 days without weaning can be taken with drug aphrodisiac: 1 pregnant horse serum or PG600; 2 boar lure; 3 exercise; 4 same-sex stimulation (fighting, climbing). (6) 400 mg vitamin E in the sow diet and 7 ml intramuscular injection of 5 ml diethylstilbestrol.
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