The rational use of reproductive hormones can increase the number of sows in sows, effectively increase the parity of sows, and control the delivery. It has great promotion potential. The author now combines practical experience and expert advice, proposes the following operating methods for peer trials.
First, prevention and treatment of sows flu (a) gilt. Prevention: Intramuscular injection of 1000 IU chorionic gonadotropin at 6 to 7 months of age. Do not breed at the first oestrus. Normally breed in the third trimester. Treatment: Sows older than 8 months of age are not estrus and should be injected intramuscularly with 2000 international units of chorionic gonadotropin, generally 2 to 4 days after injection to allow for estrus. (b) of the sows. Prevention: Intramuscular injection of 1000 IU chorionic gonadotropin intramuscularly on the day of weaning can enable normal estrus in sows. Treatment: Sows have not been estrus for more than 15 days after weaning and should be administered intramuscularly with 1000 international units of human chorionic gonadotropin, cloprostinol 0.1 mg, and estrus should be estrus for 2 to 4 days after injection.
Second, improve the conception rate and number of births (a) 1 hour before sow mating, intramuscular injection of ovulating hormone No. 3 20 micrograms, each child can increase the number of childbirth 0.6 to 1.2 heads. (b) For sows with normal heat but not pregnant or low number of births per child, intramuscular injection of 1000 IU chorionic gonadotropin in the early stage of sow estrus, 1 h before mating, intramuscular injection of 20 μg of oxytocin 3 Can achieve satisfactory results.
Third, the control of delivery according to the exact expected date of the sow 114 days of calculation, in the pre-production period 9 to 10 am the morning before the intramuscular injection of cloprostenol 0.1 mg, usually the next morning delivery, this can effectively prevent the first production of sows dystocia And easy care.
IV. Postpartum treatment Sow On the next day after giving birth, intramuscular injection of cloprostenol 0.1 mg, under normal circumstances, does not require the use of antibiotics for treatment or prevention. This can reduce the sow's stress, effectively promote the recovery of uterus and ovarian function, increase the amount of colostrum secretion, avoid endometritis, retention of the placenta, endless lochia and other diseases, shorten the sow empty period.
Fifth, induction of sow abortion (a) pregnant sows more than the expected date of birth still does not give birth, can be intramuscular injection of cloprostinol 0.1 to 0.2 mg, so that it can be delivered the next day. (b) Intramuscular injection of cloprostenol 0.2 mg to pregnant sows (such as stillbirth) can normalize delivery and effectively discharge stillbirths without causing any adverse effects on sows.
Sixth, the application of boar (a) boar libido is not strong, lack of sperm vitality, intramuscular injection of chorionic gonadotropin 2000 ~ 4000 international units, this can effectively improve semen quality. (b) The number of boar spermatozoa is small and can be administered by intramuscular injection of 20 μg of ovulating ovulating hormone No. 3 twice a day for 2 to 3 days.
VII. Precautions (1) When the sows are inactive, the sooner the treatment is, the better. (b) Injection of cloprostenol should be performed in the morning so that the sows can give birth on time the following day during the day.
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