The core tip: The modern pig production requires the breeding pigs to be balanced throughout the year to ensure that the hogs are listed in batches, and that they continuously meet the market's needs all the year round to obtain sustained and stable economic benefits. Therefore, it is necessary to grasp the utilization of breeding pigs. In the best breeding stage, intensity utilization is carried out in the appropriate breeding stage. When the reproductive performance declines, it should be eliminated in time, so as to effectively reduce the production cost. Utilization of boars With a suitable period of use, the breeding performance of young pigs will continue to increase after they start mating. When they reach the age of 2 to 3 years, they will be the period with the highest fertility. Since then, as the age increases, sexual function will gradually decline until sexual failure. Under normal circumstances, young adult boars have strong sexual desire, rapid sexual reflexes, and good semen quality, which can result in high conception rates for sows. At the same time, boars of this age range are physically flexible, have strong limbs, and have less limb and foot disease. Old-born boars have poor libido, slow sexual reflexes, heavy and heavy body, inflexible extremities, often with mild or severe limb and foot disease, and poor ability to breed. Therefore, boars are generally used only for 2 years to 3 years. For boars longer than 3 years, they should be eliminated in time unless the constitution is particularly good and the fertility rate of mating is particularly high. Appropriate use frequency When adopting the seasonal centralized breeding management mode, an adult boar can be used to breed 1 to 2 times per day, but it should be guaranteed to rest at least 1 day per week; young boars should be bred once a day and rested after 3 days of continuous breeding. 1 Day -2 days; older boars can be bred twice a day and rest for 1 day after 3 days of continuous breeding. The following frequencies can be used in large-scale pig farms: When 8 to 12 months old boars are naturally bred, they are bred twice a week. When artificial insemination is performed, sperm is collected once a week; boars older than 12 months are naturally At the time of mating, breeding is performed 3 times per week. When artificial insemination is performed, sperm is collected once every 5 days. Appropriate semen quality Regardless of what kind of breeding method is used, conditional farms must always check semen quality, require sperm viability above 0.8, medium density, and malformation rate should not exceed 10%. The normal semen color is milky white or off-white, with a slight odor and no other color or abnormal smell. There must be a half-month trial training before the reserve boars are bred, and at least two semen should be checked. If the semen is unqualified, it cannot participate in breeding. Utilization of sows Appropriate breeding age Practice has proven that the mortality of sows born at the first and fifth stage of pregnancy is higher. The juvenile sows have obvious estrus symptoms, high conception rate, multiple and prolific heads, strong viability of the piglets, rapid growth and development, high yield of the sows, and strong nursery abilities. Old pigs have the disadvantage of a significant decline in fertility. Although the number of births may not be too small, the lactation capacity is deteriorating, and often individuals with low or no milk appear. They are physically bulky and have sluggish movements, and are prone to deafness and leg problems. Problems such as pressing the pigs easily can lead to accidental death. In elderly sows, the muscles of the abdomen are loose. When the breasts are lying on the side, the two or three nipples in the lower row are difficult to expose. If the necessary assistance is not given to affect the normal feeding, the newborn pigs will often die of freezing and hunger. In addition, older breeder pigs have poorer offspring ability to live, have slow growth, and often suffer from bad individuals due to genetic mutations. According to modern management requirements, sows generally use 5 to 6 tires, and individuals with excellent reproductive performance can use 7 to 8 tires. Suitable breeding weight The gilts are weighed regularly to ensure proper body weight. For the introduced pig breeds, large breeds and late mature breeds, the body weight should reach about 90 kg at the age of 6 months, and the body weight at the age of 8 months should reach 120 to 130 kg. For local breeds, small breeds and early maturing varieties, it is generally around the age of 6 months and it is appropriate to have an initial weight of 50 kg to 60 kg. If the sow is overweight, it may cause reproductive problems or fewer births; if the sow is too small, it will affect the lactation capacity and its normal development after the birth. The practice of breeding shows that the sow fertility rate of the sows with larger initial weight is relatively low, and embryos die severely. The lighter weight of the sow not only has a low embryo mortality, but also has a smaller body weight loss during lactation and does not cause postpartum sputum and other diseases. Bad individuals. According to modern management requirements, sows generally use 5 to 6 tires, and individuals with excellent reproductive performance can use 7 to 8 tires. Fruit Juice Powder
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