There are enough forage in autumn, the weather is high, the feed is full, the body condition of the cattle is good, the scent is good, the bull is energetic, the estrus cycle is accurate, and the duration is longer. It is the best time for the artificial cold allocation of cows, so the cows are kept Farmers, cattle farms, should strengthen the breeding and management of breeding cows, timely breeding. 1. Moderate temperature of cows The autumn season is the peak season of cow estrus. Before the arrival of the cow breeding period, breedable cows should have a moderate lyrical condition. Over-fat or slender cow body conditions are not conducive to breeding. For lean cows, to adjust the daily supplement, increase nutrition, available corn 40%, barley 30%, wheat 20%, 10% soybean meal, mix well after soaking in water for more than 4 hours beating. Then add 10%, 5% bran, 1% salt, and 3% to 5% bone meal for the total amount of the above-mentioned feedings. Daily supplements are given to the cows twice a day, morning and evening, and the amount (even soup with water) is 7 to 10 kg. In this way, the cows will be able to rejuvenate and rejuvenate, and they will achieve the purpose of timely estrus and mating. 2. The estrus cycle of the artificial cold-matched cattle is 18 to 21 days and the duration is 1 to 2 days. When the cows are in estrus, their appetite diminishes and they are excited. They like to approach the bull, cross over each other, have less urine, have reddened pussy, congested and swollen, often accompanied by white translucent mucus, and some cows also have a small amount of blood flowing from the vagina. At this time can touch the cow's buttocks, oxtail Gao Qiao, quiet and motionless, two hind legs fork opening for mating action. After a gradual recovery of appetite, loss of libido, swelling of the vulva gradually disappeared, and less mucus (rectal examination, is in the follicular maturation or ovulation), this time the most suitable for insemination and breeding of cows. The time between the end of estrus and the end of harvest is 10 to 15 hours. The appropriate time for breeding is 8 to 12 hours after the start of harvest. 3. Repeated breeding In order to increase the conception rate, a method of repeated breeding may be adopted, that is, the breeding is repeated once for 8 to 12 hours after the first breeding. 4. Artificial aphrodisiac breeding One is the opposite sex to induce aphrodisiac, with the estrus bull chasing not receive the cow, so that the cow estrus. The second is the hormone drug aphrodisiac, estrus cows, can choose the following injection of an estrogen, the amount of ethylene estradiol 25 to 35 mg, 40 to 60 mg of diphenol ethane, 3 to 5 grams of triads After the injection, the cow can be estrus. Third, the traditional Chinese medicine aphrodisiac, Motherwort 30 grams, 24 grams of pumpkin leaves, 15 grams of red Cang, Jianshui cattle to gavage. Jujube split skin 0.5 kg, 1 kg of brown sugar, add water, 3 kg, Jianshui to cattle 2 times sooner or later gavage, and even served 2 to 3 days, the cow can be estrus artificial cold. 5. Artificial cold management After the cows are mated, do not allow the cows to exercise vigorously within 1 to 2 hours. Try to avoid cows drinking or eating too much. After artificial cooling, 15 nights should be fed at night, and 1 to 1.5 kg of wheat bran or distiller's grains should be fed at the same time, and clean drinking water with a small amount of salt should be given to facilitate implantation of fertilized eggs. The daily amount of salt is 25-28 grams. During pregnancy, the cow needs a lot of nutrients itself and the fetus, so pregnant cows should be supplied with protein, vitamins, and mineral-rich feed. If the feed alone or feed supply is insufficient, cows and fetuses will be malnourished, affecting the normal development of cows and fetuses, and the fetus will die when severe. Special care must be taken to prevent cows from aborting and not to feed feeds that are toxic, deteriorating, toxic, and overly acidic. Do not feed frozen, intensely irritating feed to prevent enteritis, miscarriage, or production of weak, stillbirths. Do not let the pregnant cow be frightened to cause uterine contraction and miscarriage, but also to prevent bodily cows from colliding, slipping, whipping, or the overhead frame and mechanical abortion. The valve is a series of gas emergency shut off solenoid valves, specially designed as gas pipe breaker for emergency use. It can be connected with gas leaking detection sensor, fire alarm circuit or other intelligent sensor modules so that on site or remote shut down on gas supply (manually or automatically) is possible, hence ensuring the safety on gas usage. The valve features an auto-close when strong vibration is detected. After close, manual operation is required to turn on the valve. This feature meets safety regulations in the event of an accident. Gas Solenoid,Solenoid Valve,Gas Solenoid Valve,Solenoid Operated Valve Rictron Industrial Co., Ltd , https://www.szrictron.com