Scientific selection of reserved gilts plays a very important role in improving their production, reproduction and performance, and extending their useful life and increasing the economic benefits of pig farmers (fields). The following points should be addressed: The pedigree should inquire into the parental production performance of the gilt sows, no genetic defects, at least nine or more of the same fetuses, piglets weighing 1.2-1.5 kilograms, multiple nipples and neat rows, good shape piglets reserved for gilts. Repeated selection of piglets 28 or 35 days of age, weighing more than 7.5 kg for initial selection, more than 6 pairs of effective nipples and at least 3 pairs of previous umbilicus, no milk and nourishes small nipples, vulva correct, slightly higher extremities Strong and powerful, with open chest and wide hips; the second selection is about 70 days old. At this time, attention should be paid to appearance, hairiness and lightness, skin redness and smoothness, elasticity, straight back and strong body. Neat, thick and prominent nipples, good development of the vulva; the third seed selection in about 5 months of age, selected on the basis of the first two seed selection, the overall requirements of normal growth and development, to ensure that no fat is not fat species Body condition, sexual maturity and body maturity develop in parallel and can be estrus as scheduled. In addition to inquiring about genealogy and multiple seed selection, other aspects should also be considered in selecting certain diseases. For example, pregnant sows suffering from parvovirus disease produce live piglets with mummified fetuses, which may be carried by parvovirus diseases. Piglets that cannot be kept as gilts and have suffered from diseases such as panting, Breeding and Respiratory Syndrome cannot be reserved for gilts. Also, they should not be the offspring of the first and old sows. Selected to stay gilts. After selecting the reserve sow, in the rearing and management direction, the following measures shall be taken: The shed sanitation shed should be kept cool in winter and cool in summer, suitable in temperature, dry and clean, with sufficient sunshine, and reared in small groups, 3-5 per lap. Each head has a circle area of ​​at least 0.8 square meters in order to ensure normal development of its limbs, avoid moisture crowding, and prevent diarrhea and skin diseases. Feeding gilt sows on scientific feeding and feeding should be carried out to ensure feed quality. Crude protein should be 15% to 16% per kilogram of diet, digestive energy 3000-3,100 kcal, and 2-3 times daily, providing adequate sanitation. The drinking water, in turn, also fully meets the requirements for calcium, phosphorus, and vitamins so that the bones and reproductive system are fully developed. It is advisable that the pig's body condition reach 80% of its weight, and aquafeeding should be carried out two weeks before breeding. When the gilts are of appropriate age, the gilts begin to estrus after sexual maturity. The initial estrus symptoms are often not obvious and regular, and then gradually become obvious and regular. The estrus occurs approximately once every 18-21 days, and is an estrus cycle, second or third. A estrus cycle is more suitable for breeding. The appropriate initial age and weight for the local breed pigs 6-8 months of age, weight about 50 kg, China's cultivated varieties and introduced species abroad about 10 months of age, weight 90 kg. Careful management should be carefully managed, regularly disinfect the pig house and its surrounding environment, and carry out deworming and immunization work according to deworming and immunization procedures. Exercise should be carried out for 30 minutes every day to enhance physical fitness, reduce disease, and promote bones and muscles. The development of the body ensures that the limbs are robust and increase fertility.
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