First, why pregnant sows abortion
The heat stress brought about by the high temperature seriously affects the sow's sitting rate, embryonic mortality, and miscarriage rate. The sows after pregnancy were subjected to hot stress, and the fertilized eggs did not form placenta at the beginning of the uterus attachment and lacked protection. Both the first 20 days of pregnancy and the 30 days of the second trimester are the risk of stillbirths and abortions for pregnant sows, and the most dangerous is 18 days after pregnancy. During the first 8 days of the pregnancy and the 11 to 20 days of the embryo attachment, the sows are most afraid of heat, even if only 24 hours of high fever, it will lead to early embryonic death, 100 days after the pregnancy is in the most sensitive to heat sensitive period. Due to the long-term stimulation of heat radiation and high-temperature conduction during pregnancy, the sow's body temperature rises, and body temperature regulates the center, it is difficult to maintain its own thermal balance, and the sow's physiology undergoes a series of pathological changes. This kind of heat stress inhibits it. The secretion of luteinizing hormone and the secretion of progesterone are reduced, eventually leading to abortion of sows.
Second, to create a cool and comfortable breeding environment
After the summer heat, the roof of the pig house should be made of materials such as straw curtains with good heat insulation to block the heat radiation of the sun and make the pig house cool. At noon above 30°C, the water can be sprayed on the roof to reduce the temperature. In addition to opening the north and south doors and windows for ventilation, the air fans can be used to increase the air convection to remove the heat from the pigs and cool the pigs. If necessary, cool with a cold water spray or cool with a wet curtain. When the temperature reaches above 35°C, cold water can be used to shower the pig body, and it can also be used to brush the pig body. When it is hot again, you should increase the number of showers and brushing the pigs to keep the sows from overheating.
In the farm, trees and grass are planted to cover the ground and form a cool microclimate environment. The removal of feces from the piggery can not only eliminate the pollution, but also keep the pig house sanitary, so as to prevent fermentation heat production and increase the temperature.
Third, grasping pregnant sows
When pregnant sows are kept on hot days, attention should be focused on the first 8 days of pregnancy. This stage is the stage of implantation of fertilized eggs and the formation of placenta, and should focus on the protection of embryonic development and flow prevention. Within 20 days of pregnancy and within 30 days of prenatal gestation, it is necessary to strengthen nutrition and raise nutritional levels to meet the nutritional needs of protein, vitamins, minerals, and trace elements. By the second trimester of pregnancy, it is necessary not only to meet the nutritional needs but also to meet the quantity requirements, and to feed the concentrate to meet the rapid growth needs of the fetus and increase the birth weight. Hot sows do not like to eat in the weather, but can reasonably arrange feeding time, increase feeding times, and increase feed intake. In addition to normal feeding, when the temperature drops early one night, when the pigs love to eat, increase the amount of feeding properly, you can feed more than 65% of the amount of the whole day.
At the same time, it is necessary to feed more green fodder containing less fiber, and feeds containing more fiber-rich roughage and rice bran to prevent pigs from increasing body heat. When the energy is not enough, the oil can be fed 3% to 5%, with high heat energy, less heat, not only increase energy feed, but also reduce the effect of heat stress.
In the hot summer days, pigs drink large amounts of water and should be supplied in large quantities, free to drink, to meet needs, drink cold water, and help feed digestion. In the later stages of pregnancy, mechanical stimuli are eliminated to prevent slipping, crowding, and jumping. Avoid hitting pigs, chasing, and scaring so as not to cause miscarriage. In order to ensure the normal development of the fetus in order to avoid fetal, stillbirth or miscarriage, a 2ml progesterone should be injected within 2 days after the pregnancy, which can effectively ensure the survival rate of the fetus. For sows with chronic abortions, progesterone injection may be given intramuscularly 2 months after pregnancy, once every other week, and once every 3 weeks. The sow was pregnant for one week and she was given 50 ml of choline chloride solution and was fed until 3 days before childbirth. Three days before the sow’s arrival, each pig’s daily diet was fed with VC1 grams to prevent sudden death from sows’ postpartum hemorrhage.
Fourth, strengthen sow management and miscarriage
Pregnancy sows are particularly sensitive to sudden changes in the environment. Regardless of exercise, feeding, catching, overheating, etc., they are all poor stress and stimuli. They can cause miscarriage of pregnant pigs and must establish normal life patterns. Pregnancy pigs should be single-circle, single-tube, single-feed to prevent pigs from biting each other to avoid miscarriage.
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