How to increase the conception rate of the sow?
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1 Ensure the quality of semen 1.1 Grasping the breeding and management of male boars Male boars must be fed special feed for boars. Feed them twice a day, feed 2.5-3kg per head per day, 1 egg, and add 2-3kg of green feed each day. The temperature of the boar can not exceed 28oC (above 28oC adverse effects on the sperm), keeping the pens and the pigs clean, and the boars are driven out of the pens for 30 minutes every morning. 1.2 Strict semen quality semen collection, the first sensory view semen volume, color and odor (normal ejaculation amount of normal semen is 150-300mL, the color is milky white or light gray, slightly smelly), if the sense of normal , Microscopic examinations should be performed immediately. Fresh spermatozoa with a viability above 0.7 can be diluted, otherwise it is discarded. Semen should be diluted as soon as possible after collection, and the original sperm will not be stored for more than 30 minutes. Diluted with semen-specific diluent. When diluting, dilute the temperature of the diluent to the temperature of the semen. Slowly pour the diluent into the semen along the cup (bottle) of the semen, gently shake it, mix it, and then dispense. . 1.3 Semen Storage The ambient temperature for storage of semen must be controlled between 11-17oC. The temperature difference between day and night should not exceed 2oC. It is best to use a 17oC constant temperature freezer. The diluted semen was stored at room temperature (22-25oC) for 1 h and then wrapped in several layers of towels and stored directly in a 17oC thermostat. Semen should be shaken every 12 hours during semen preservation in order to prevent sperm death caused by precipitation. Shelf life is generally not more than 3d. 1.4 Semen storage during insemination Semen in cold winter or hot summer cannot be exposed to the outside for too long (because heat stress or cold stress will affect sperm quality). In the winter insemination, the semen bottle should be placed in the palm of your hand Heat 2-3 minutes to avoid semen backflow caused by low semen temperature. Semen transport should be stored in a foam box, cool water in the summer and warm in the winter. 2 Overcome the sow's own reasons 2.1 Selection of sows to stay Overcoming the traditional selection methods of the mother to stay, the selected binary sow sow body size to meet the requirements of reproductive production, body size, flat back, wide hindquarters The developed, limbs are strong and slightly longer, the vulva is normally developed, the vulva is larger and the effective nipples are more than 7 pairs; the parents of the binary cross sows used for breeding should have excellent reproductive performance, with Landrace or Yorkshire as the first male parent Crossbreeds are produced to grow or grow up to two long-term sows. Duroc is generally used as a terminal male parent. 2.2 Mature mating sows and sexual maturation of mating sows of late age are generally late. Normally they reach sexual maturity at 6-8 months of age. Don't rush to breed at this time. Wait until the body weight reaches 120kg or more. After 3 periods of affection, it is the 4th estrus. Can be mated. 2.3 Grasping the rearing of the sow The sow must be fed special sow feed (separated empty sow feed, pregnant sow feed and sow feed). The feed is different depending on the stage. The sows are moderately scented and must not be too fat or too thin, and they must be supplemented with certain green feed to ensure the normal supply of vitamins. 2.4 Time-out The categories of non-applicable sows that are not suitable for use are: estrus symptoms are not obvious, and the estrus cycle is irregular; long-term infertility and treatment are not significantly improved; temperament is fierce, and maternal is poor; lactation performance is poor and nipples are defective; Suffering from infectious diseases. Because the above types of sows not only have low conception rates but also have low productivity, they have no practical value.