How do pregnant sows spend the hot summer

The pregnant sow occupies an extremely important position in the pig farm, which can be said to be the production lifeline of the pig farm. If the hot day after catching up with the Summer Solstice, poor management, stillbirth or abortion, the loss will be heavy; if the feeding and management is good, heat prevention and cooling is effective, then it can kill two birds with one stone, which can not only make pregnant sows safely spend summer and give birth, but also increase the litter size in pig farms, expand reproduction and improve economic benefits.

? Why pregnant sows miscarry

Heat stress caused by high temperature seriously affects the sitting pregnancy rate, embryo mortality and abortion rate of sows. Pregnant sows are damaged by heat stress, and the fertilized eggs do not form placenta at the initial stage of uterine attachment and lack of protection. The first 20 days of pregnancy and the 30 days of late pregnancy are the risk periods for stillbirth and miscarriage in pregnant sows, and the most dangerous period is within 18 days after pregnancy. Within 8 days of early pregnancy and 11-20 days of embryo attachment, sows are most afraid of heat, even if only 24 hours of high fever can lead to early embryo death, and is in the most sensitive period after 100 days of pregnancy. Because pregnancy is stimulated by heat radiation and high temperature for a long time, the body temperature of sows increases, and it is difficult to maintain their own heat balance depending on the center of body temperature regulation, resulting in a series of pathological changes in the physiology of sows. This heat stress inhibits the secretion of luteinizing hormone and progesterone, and finally leads to sow abortion.

? Create a cool and comfortable breeding environment

The Beginning of Summer after the hot weather, the pigsty roof to use good thermal insulation grass curtains and other materials, in order to cut off the sun's thermal radiation, so that the pigsty cool. When the temperature is more than 30 ℃, water can be sprayed to the roof to cool down. In addition to opening the north and south doors and windows for ventilation, the exhaust fan is used to increase air convection, which can take away the heat of the pig and cool the pig. Use cold water spray or wet curtain to cool down if necessary. When the temperature is more than 35 ℃, you can shower the pig body with cold water or brush it with brush. When the weather is hot again, you should increase the number of showers and brushing the pig body to keep the sow body from overheating.

It is recommended to plant more trees in the pig farm to cover the ground and form a cool microclimate. The pig house should remove manure frequently, which can not only eliminate pollution, but also maintain the hygiene of the pig house, so as to avoid fermentation heat production and raise the temperature of the pig house.

? Do a good job of raising pregnant sows

When raising pregnant sows in hot days, attention should be focused on the first 8 days of pregnancy, which is the stage of implantation and placenta formation of fertilized eggs, and emphasis should be placed on protecting the development and prevention of embryos. Within 20 days of pregnancy and 30 days before parturition, the nutrition of sows should be strengthened, the nutritional level should be improved, and the nutritional needs of protein, vitamins, minerals and trace elements should be met. To the late pregnancy, not only to meet the nutritional needs, but also to meet the quantitative requirements, feed concentrate to meet the rapid growth needs of the fetus and improve the birth weight. Sows do not like to eat in hot weather, so the feeding time can be arranged reasonably, the feeding times can be increased and the feed intake can be increased. In addition to normal feeding, it is necessary to increase the amount of feed one morning and one night when the temperature drops, while pigs like to eat, and can feed more than 65% of the whole-day feed.

At the same time, it is necessary to feed more green fodder with less fiber, not roughage with more fiber and rice bran, so as not to increase the body heat of pigs. When the energy is not enough, the oil can be added by 3% to 5%, which has the advantages of high heat energy and less heat increase, which not only increases energy feed, but also reduces heat stress.

Hot days in summer, pigs drink a large amount of water, should be a large supply, free to drink, to meet the needs, drink cold water cool, contribute to feed digestion. Especially in the third trimester of pregnancy, mechanical stimulation should be eliminated to prevent slipping, crowding, running and jumping. Do not hit pigs, chase, frighten, so as not to cause miscarriage. In order to ensure the normal development of the fetus and avoid fetal transformation, stillbirth or abortion, 2 ml progesterone should be injected into the sow within 2 days after pregnancy, which can effectively ensure the survival rate of the fetus. For sows with chronic abortion, progesterone injection can be injected intramuscularly 2 months after pregnancy, once every other week, 3 times as a course of treatment. Sows pregnant for one week can be fed with 50 ml choline chloride solution until 3 days before delivery. Three days before parturition, VC1 grams were added to the daily diet of each sow to prevent suffocation caused by postpartum hemorrhage.

? Strengthen sow management and fetus protection

Pregnant sows are particularly sensitive to sudden changes in the environment, no matter exercise, feeding, catching, overheating, etc., are bad stress and stimulation, which may cause miscarriage of pregnant pigs, and a normal life rule must be established. Pregnant pigs should be fed in single circle, single tube and single feeding to prevent pigs from biting and fighting each other so as not to cause miscarriage.