In order to mate the estrus at the same time for the sow, in order to increase the number of litters per year of the sow, it is necessary to promote the early estrus of the sow. Some sow piglets still do not have heat during the first 10 days after weaning. In addition to improving feeding and management conditions to promote estrus, measures should also be taken to control heat. The method for controlling normal estrus in sows is as follows.
1. The boar induction method often uses the trial boar to chase non-estrus empty sows. Through the pheromone odor and contact stimuli secreted by the boar, it can cause the pituitary gland to secrete follicle stimulating hormone and promote sow estrus. ovulation. This method is simple and effective, and it is an effective method. Another simple and effective method is to play a boar for sound recording tapes, use conditional reflexes to try the situation, and try it out day after day. The effect of this biological simulation is also very good. .
2. Gathering herds together, the herds that are not estrus are merging into the circumscribing gilts and stimulate the ovulation of sows by climbing.
3. Massage the breast to the sow that does not have heat, can use massage breast to promote estrus. The method is to feed each morning with the palm of your hand and massage the skin with the palm of the hand for about 10 minutes. After a few days, the sows have estrus and then massage the breasts 5 minutes each day. Deep massage for about 10 minutes on the day of mating. The role of surface massage is to strengthen the anterior pituitary function of the follicle to mature and promote estrus. Deep massage is to use the tip of the finger on the skin around the nipple, do not touch the nipple, make a circular motion, massage the mammary gland layer, massage each breast in turn, mainly to strengthen the pituitary gland to promote the secretion of luteinizing hormone and promote ovulation.
4. Strengthening exercise to drive sluts without estrus can promote metabolism, improve sensation, accept sunlight, breathe fresh air, and stimulate ovulation in sows. If combined with grazing, the effect will be better.
5. The litters of piglets born to sows with poor calving and poor sows are all fostered and fed to other sows in the same period after the colostrums have been eaten so that the sows can be returned early, and the estrus can be used for breeding and breeding. The number of nests is increased and the number of piglets per year is increased.
6. Hormonal aphrodisiac was used to induce ovulation induction of estrus in sows that received 100 IU of chorionic gonadotropin (HCG) per 10 kg of body weight or 1 ml of gestation horse serum (PMSG) in estrus sows (800-1000 IU per intramuscular injection).
For those sows whose reproductive organs are diseased and difficult to treat, and sows with low breeding age, they should be eliminated in time and supplemented with excellent gilts.
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