Main measures to increase fertility rate of fertile sows: The first is weaning early. The early weaning is based on the sow’s lactation status. After the 21st day of sow farrowing, the concentration of milk nutrient and the amount of milk production began to decline. The growth and development of piglets is in a vigorous period. Contradictions are prominent. Early weaning must be based on early supplementation. , breakfast will be based on the material. It is required that the piglets begin to be tempted at 7-8 days of age and learn to eat at about 15 days of age. The sows can be gradually weaned on the 35th day to gradually reduce the number of breast-feeding, which can shorten the lactation period of about 10d. The second is to shorten the period of weaning to breeding. After a period of lactation, some sows have poor body condition and have serious droppings. After complete weaning, the sows are reared in several heads and have access to mature boars, combined with short-term excellent feeding. Early estrus can be achieved and early mating can be achieved to increase the number of litters per year. The third is to ensure the quality of boar semen. Boar feeding and management should be appropriate, given high protein content, rich minerals, vitamins, full-priced compound feed, proper exercise, reasonable control of sperm collection or natural mating frequency. Regular inspection Check the quality of semen to ensure that the sperm motility is above 0.7 and the sperm density is above average. The fourth is to control sow estrus identification. The gilts raised for 8 to 10 months of age and 80 to 100 kg of weight for the initial mating age, because the estrus symptoms of lean-type sows are not obvious, it is easy to miss the timing of mating, grasping the sow estrus identification is to increase the mother The key link of the pig reproduction rate, the estrus cycle of the sow is usually 20-21d, each lasting 3-5d, mainly adopting the "one look, two touch, three press, four test" methods to identify the estrus of the sow, a look at the sow Vulva swelling, congestion, redness, vaginal mucus spillover, loss of appetite, urinary frequency, disturbed movement or trance and the occurrence of cries, mutual crawling and other characteristics; second touch is to touch the sow vamp, vagina, a creamy feeling, and the temperature is higher than normal temperature Feeling hot; three presses press the waist, the sow is standing still, there is standing reflection, looks sluggish, raised, ears upright; four trials to the sow to the pigs, performance to accept the climb or climb Other pigs have copulation and courtship responses. Through this method of testing, in accordance with the above conditions to prove the sow estrus. The ancestors of Changyuan, Jobi or Changtai, Jotai or Evergreen, and Joo Jong are more obvious and easy to judge. However, the estrus symptoms of YL (LY) sows are not obvious. The external observations only show the vulva swelling, the color of the vulva, the vulva Flow out of mucus, combined with pressure back test and boar test method. The husbandry and management personnel must be meticulously managed in conjunction with sow physiological changes to observe changes in the vulva. The fifth is timely breeding. The beginning of sow estrus, 15-24 hours after identification is the breeding period, when the estrus vulva swollen and began to shrink, the color gradually faded from the red, mucous thickened by thinning, can pull into 2-3cm long filaments When the best breeding time, generally use the "old with early, small with late, middle and middle age with the" method of mating, that is, the old sow on the day of the estrus and the next day, the first distribution of sows in heat in the third Day and fourth day, the young sow is allocated on the second and third day of heat, and the estrus sow has two periods of 10-12 hours each to increase the conception rate and the number of litters. Artificial insemination techniques were used to inseminate the estrus sow 2 times in a love period, and the insemination dose was 80 ml (40 ml/time). Cylinder Locks,Cylinder Key Lock,Pin Cylinder Lock,Smart Cylinder Lock ZHEJIANG ZHONGZHENG LOCK INDUSTRY CO.,LTD , https://www.zhongzhengcabinetlock.com