In swine production, it is very common that adult sows are not estrus for a long time or repeated infertility. This phenomenon prolongs the interval between sows' litter size and raises the cost of feeding. The reason is complicated and the treatment is also very tricky. Feeder headache problem. The author has now introduced the prevention and control experience accumulated in practice as follows, and is willing to share and discuss with readers.
1. Feeding sows who are infertile should adjust sow nutrition and strictly follow the feeding standards to give full-price nutritional feed. Supplement with various vitamins and minerals. For infertility caused by over-fertilization, it is first necessary to reduce the concentrate, increase the amount of green feed, and increase the amount of exercise for the sow. After a period of time, you can escort with natural estrus, and it is easy to conceive. If the sow caused by feed poisoning is infertile, stop poisonous feed immediately. In addition to the full-price mixed feed, increase the amount of green feed, or add extra VE to the feed to increase the VE content in the feed and promote the sows. restore.
2. Use boar sedation. Trying boars to chase non-estrus empty sows, or keeping males and females in the same pens, because the boar touches activities such as crawling, and the pheromone odor and contact stimuli secreted by the boar can be caused by nerve reflexes. The follicles of the sow produce follicle-stimulating hormone, which causes ovulation in the sows.
3. For estrus caused by breastfeeding, to reduce the burden on the sow, weaned piglets in advance, the sows can advance to heat. Large-scale pig farms generally reduce the period of breast-feeding to 28 days or less, and traditional pigs should also reduce their weaning days to within 40 days.
4. And nest. For piglets born to sows that have fewer litters or sows that have poor milk production ability, after the colostrum is eaten, the two litters will be merged, provided that the litters of the two litters have similar time of farrowing, so that sows without sows , you can advance estrus breeding.
5. Group and circle. The non-estrus empty sows were housed in estrus sows, stimulated by escaping and sniffing to stimulate ovulation.
6. Massage the breasts. For estrus-free sows, after each morning's feeding, a superficial massage is performed with the palm of the hand. Each breast is about 10 minutes. After a few days, the sow has signs of estrus. Then she performs 5 minutes of superficial and deep massage. The deep massage is performed on the skin around the nipple for 10 minutes. Touching the nipple to make a massaging massage around the mammary gland layer, in turn massage each breast, mainly to strengthen the stimulation of the pituitary gland, promote the secretion of luteinizing hormone, and promote ovulation.
7. For ovaries quiescent sows, the following hormones can be used for treatment. (1) injection follicle stimulating hormone, it has the role of follicle growth and maturation, can be injected 50-100 units. (2) Injection of pregnant horse serum, subcutaneous injection of 500-1000 units, estrus mating after 4-5 days, and can increase the number of litters in sows. (3) Injection of human chorionic gonadotropin in the treatment of ovarian static and atrophy, sow intramuscular injection of 500-1000 units, if necessary, repeated at intervals of 1-2 days, need to pay attention to a small number of cases, allergic reactions may occur, should be used with caution . (4) Injection of ovulation hormone 3, diluted with water for injection, intramuscular injection of 10-25 micrograms, once daily, can be 2-3 consecutive times, but the total amount does not exceed 100 micrograms. (5) injection of estrogen diethylstilbestrol, sows intramuscular injection of 4-10 mg; estradiol benzoate, intramuscular injection of 2-8 mg; triadogen intramuscular injection of 2-4 ml, injection can cause sows to heat but generally do not ovulate The second natural estrus can have follicular development and ovulation.
8. Treatment of follicular cysts. (1) injection promote row 3 10-25 micrograms, applicable 2-4 times, but the total does not exceed 100 micrograms, generally 3-6 days cysts form the corpus luteum, 15-30 days after the return to normal estrus cycle, you can breed ; Chorionic gonadotropin 500-1000 units; luteinizing intramuscular injection of 50-100 units; progesterone 10-50 mg. Intramuscular injection, even for 7-14 days, also has better results.
9. Treatment of corpus luteum cysts and persistent corpus luteum, intramuscular injection of cloprostenol 0.2-0.4 mg, usually once can be estrus breeding; promote row 3 10-25 micrograms each time, once used 1-4 times, there are better Efficacy; placental tissue fluid, subcutaneous injection of 4-10 ml, about 6 days to heat.
10. The use of Chinese veterinary therapy for ovarian quiescence and sow uterine retardation can also achieve better results. In the sow feed, add 50 grams of aphrodisiac every day. The prescription for aphrodisiac powder is as follows: Epimedium 6g, Yinqi 6g, Angelica 5g, Cyperus rotundus 5g, Cuscuta 3g, Motherwort 6g, 5-7 Days; acupuncture therapy: can acupuncture sows Baihui, (located in the middle of the lumbar recommended sag zhongzhong acupoint), straight down into the needle 3-5 cm, at the same time with acupoints after the sea cave (also called Jiaomian, located in the anus and tail Between the depressions) diagonally into the needle 2-4 cm, 5-10 minutes daily.
11. If the sow suffers from acute or chronic endometritis, it may be taken by a drug flush. It may be taken 1-2 days before estrus (without estrus injectable estrogen to promote its estrus), with 1% saline or 0.1% hypermanganese Potassium or 1% rivanol 100-200 ml heated to 38-40 °C, rinse the uterus, discharge the rinse, and then use 1 gram of aureomycin (or tetracycline, terramycin) plus 100 ml of distilled water to inject into the uterus. 1-3 days and then again, while oral or injection of sulfa drugs or antibiotics, usually after this treatment can be normal pregnancy litter, if permanently cured, should be eliminated.
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