To do a good job of sow winter breeding management and improve their survival rate is the key to achieve high yield and high efficiency of sows. Over the years, many livestock farms have severely affected litter size and survival rates due to the low level of technology and facilities during the breeding and feeding of sows in winter. Strengthen the management of late pregnancy and increase the birth weight of piglets. Research shows that embryos begin to develop rapidly after 80 days of pregnancy, and fully mature to 110 days. The size of the primary birth is directly related to the survival rate and growth of the piglets after birth, that is to say: one or two birth weight differences, 500% of weaning weight, and 5 kg slaughter. Therefore, in order to promote the rapid development of the fetus, increase the birth weight and ensure the nutritional reserve of the sow during lactation, after the sow is pregnant for 80 days, the quality and quantity of the feed must be increased. The selection of raw materials should focus on consideration of feeds rich in calcium, protein and fat. Cooked soybeans are the best choice for the sow's dietary composition, which is both a source of high-quality protein and a means of fat supply. Adding fat to the sow diet can increase the level of ketogenic substances in the plasma, increase the sow's metabolites by means of the glucose distribution effect for the development and utilization of the fetus, and at the same time increase the energy reserve of the fetus, thereby increasing the piglet survival rate. . Control the temperature in the house to create a comfortable environment for the mother. The environmental temperature required for piglets and lactating sows is different. The optimum temperature for newborn pigs is above 32°C, and the optimum temperature for sows is between 15°C and 18°C. between. If the temperature is raised to above 30°C simply, although the requirements of the piglets are better adapted, on the one hand, the cost of warming and heat preservation is increased. On the other hand, the lactation and feeding of the sow are also negative. The impact also increases the harmful gas content in the house. Therefore, how to form a sow with a temperature of 15°C to 18°C, piglets above 30°C, good ventilation, and sufficient light is an important measure for the management of sows. In this regard, all regions have explored many experiences. Some have given birth to stoves in the pigs, some have played a certain role in indoor fire walls, hanging bulbs, etc., but the most convenient and economical measure for rural applications is the number of plastic greenhouses plus piglet nursery boxes As well. Specific requirements: As far as possible from the north to south of the piggery, good lighting, leeward sunny. In order to increase the lighting area, the greenhouse must have a certain degree of curvature, choose plastic without dropping film temperature greenhouses, and set the incubator in a convenient and convenient corner. The area inside the box is about 80cm80cm, and the box is heated with a 250W to 500W far-infrared light bulb or infrared heater. The temperature of the heater is adjusted from the ground level to the temperature. Note that the heater circuit must be fixed on the wall to prevent the sow arch from biting and shocking. When the shener sow has a small amount of herds and has little body heat, it can be properly heated by the fire; when the amount of herds is sufficient, the reliable body can provide heat for heating. Practice has shown that in the North China area, 15 or so farrowing huts are housed in plastic sheds, and only in perfect shed plastics, under the condition of no heat source supplementation, the sow's own calorie temperature can be maintained within the range of 10°C to 16°C. The temperature inside the incubator can be regulated above 30°C. Method to measure the suitability of piglet temperature: When the temperature is appropriate, the piglet will automatically return to the incubator after eating the milk, disperse and sleep, do not get together. When the temperature is too high, the piglet protrudes out of the incubator or is crowded at the exit. When the temperature is too low, piglets overlap under a heat source and compete for direct heat. Appropriate use of hormone preparations induces daytime farrowing practices in sows. More than 70% of sows are born at night. There was a lot of difficulties in management at the time of farrowing, and many pig farmers suffered from disability due to poor management. If the sow can breed during the day, it is easy to monitor and manage, and it is easy to increase the temperature inside the house, which has a significant effect on improving the survival rate of piglets. Cloprostenol is a prostaglandin F2a analogue, which has a strong dissolution of the corpus luteum, while exciting female uteri and diastolic cervix muscles. The success rate of induced calving in sows is more than 95%. Tests have shown that in the morning around 8:00, intramuscular injection of this preparation 0.05mg ~ 0.1mg, can be delivered at around 12 noon the next day, no obvious toxic side effects. Early control of common diseases to ensure the healthy development of the mother's postpartum lochia is one of the main causes of postpartum anorexia or postpartum alopecia syndrome. Prevention and early control of the inflammation of the birth canal are the primary tasks in the management of farrowing sows. Scientifically arranging sow diets to increase lactation The amount of milk produced by sows is the result of a combination of feed quality and diet. Surveys of households in rural farms have shown that post-partum abortion diets are more effective than dry and wet ones, and it is better to feed 4 times a day than to feed 2 times a day. The general principles are as follows: Feeding begins on the second day after birth, and constants are given at the age of 5 days. Before this, avoid overeating and injuring the stomach and wait until its function is gradually restored before feeding. The amount of air-dried material for daily intake should be greater than 4.5kg. The principle of no wastage of feed is to feed 3 times to 4 times a day, and the feed intake of sows should be increased as much as possible. During the peak period of lactation, the feed intake should be more than 6kg, and the daily feed volume should be reduced gradually to 3kg from 2d to 3d before weaning. Crude protein content in the lactation diet is ≥17%, lysine ≥0.85%, and digestive energy ≥3.2 MJ/kg. If 4% or more of fat is added, or 10% of cooked soybean is better, milk fat percentage can be increased. Timely weaning and increasing the number of sows per year of sow weaning time sooner or later directly affect the size of productive fertility. However, premature weaning can easily lead to increased mortality and slow growth of piglets. Late weaning reduces the fertility of the sow. Therefore, proper weaning time is a fulcrum for regulating the economic benefits of pig production. In the practice of rearing in rural areas, the determination of the weaning age is best determined according to the time of birth and the weight of the piglet. It requires more than 30 days of age, and each body weight should be less than 8 kg. If all the above tasks are relatively solid, the weaning can be carried out in 35 days. When weaning, we must catch the mother to keep the piglet, so that the piglet transition in the original circle for 1 week, and then turn the circle.
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