Dairy products are ideal foods with rich nutrition, reasonable ingredient distribution, and comprehensive physiological functions. Dairy products are the most balanced full-priced foods in addition to breast milk. With the rapid development of the dairy industry in recent years, the level of China's dairy processing technology and equipment has rapidly increased. China's dairy cattle breeding is changing to large-scale intensification, but limited resources have severely restricted the speed of advancement. Therefore, rapid expansion is needed to increase the production capacity of dairy cows, of which breeding will be of the highest priority. The choice of bull At present, China's single cow production is low, the choice of bulls first depends on the milk production capacity, followed by the service life, according to the actual situation of the ranch, select the right bull. The choice of semen According to the situation of cattle farms, cows with good uterus and good reproductive performance are more likely to choose sex-controlled semen. This will increase the rate of female fleas and provide more space for grazing animals to choose from. breeding At present, most of the ranches use 100% artificial insemination technology. Now we introduce the rectal grasp method of insemination. Estrus Observations 1. Cows move frequently, appetite drops, climbs over his cattle; accepts crawling, loss of appetite or waste; does not accept crawls, resumes feeding but eats less. 2. The mucus traits are scarce at the beginning; the elasticity is good in the medium term and the amount is large; the viscosity is less viscous in the later period. 3. Swelling of the vulva, reddish mucosa; swelling deeper, dark red mucous membranes; swelling disappeared to form folds, mucous membranes, etc. First of all, from the start of crawling, the cow's estrus time generally lasts from 1 day to 24 days, and insemination is performed within 6 hours after the end of heat. Secondly, observe the mucus traits. When the estrus starts, the mucus is less and more dilute. When the estrus is prosperous, the mucus is increased and the elasticity is good. At this time, if the cow crosses, it can inseminate and the mucus in the late estrus becomes viscous and gelatinous. At this time, it can be lost. fine. Thirdly, the change of follicle touched the estrus follicle through four periods, namely, follicle appearance period, follicle enlargement period, follicle maturation period, and ovulation period. Insemination should be carried out at the follicular maturation stage. Artificial insemination equipment preparation: liquid nitrogen storage tanks, high quality fine tube fines, infusion guns, infusion gun plastic jackets, plastic long arm gloves, triangular beakers, water thermometers, scissors. 1. Semen thawing and loading: When thawing, take out the slim tube semen from the liquid nitrogen storage and transport tank, and quickly immerse the fine tube in warm water of 37.5°C for 15 seconds. After the color of the semen in the tube changes, remove it and do not let it thaw. Semen temperature is too high. After the thin tube semen is removed, wipe the water on the surface of the tube with a paper towel, cut off the closed end of the tube, push the insemination gun inside, push the end of the insemination gun to the front of the plastic coat, and prepare for insemination. 2. Insemination: The breeder wears a long-armed glove, moistens with soapy water, gently massages the anus to relax it and inserts it into the cow's rectum. After removing the stool, rinse the vulva with water or wipe it off with a paper towel. Then, holding the insemination gun from the vulva into the vagina, first obliquely insert a section, avoid the urethra, and then flat plug, insert the hands together, reach the cervix, gently hold the cervix will insemination gun into the cervix, and then Insert in and pass through 2 to 3 cartilage-like spiral tissues through the cervical canal to reach the uterine cavity to inject semen. 3. Check and record: After transfusing the semen, pull the insemination gun to check if all semen in the tubules is injected into the uterus, and then make a record. Precautions in insemination operations 1. Observe the estrus accurately and observe the estrus at regular intervals. 2. When the frozen semen is thawed, during the warming process, it is necessary to rapidly pass through the crystallization danger zone, that is, minus 60°C to 0°C (minus 25°C to minus 15°C is the most dangerous temperature zone) to avoid formation of ice crystals inside the sperm cells. Sperm damage. 3. When holding the cervix, do not grasp hard if the bowel wall is too tight. 4. If the cervix is ​​too thick or difficult to grip, press the cervix or hold it in place and inseminate it on the pelvic side or lower wall. 5. When inserting the insemination gun, the hand should be gently held and moved along with the cow. If the vaginal folds block the insemination gun, do not push it inward. To change direction, turn the insemination gun and massage or gently lick the intestinal wall with the hands in the rectum to distract the cow. 6. When the sperm insemination gun is not on the cervix, it is necessary to check whether the hand grasped before, resulting in free drooping neck, should be promptly corrected. 7. Must go through 2 to 3 hard spiral tissue, if there is blockage, to turn the infusion gun to insert, through the cervix to reach the uterus, before injecting semen. 8. When injecting semen, the inseminar should be pulled back a little to avoid hindering the insemination muzzle. Breeding of bred cattle Breeding cattle is the development capital of grazing land and is the main factor determining the future of grazing land. The bred broilers are initially bred for ages from 16 months to 18 months, and the bred cows can start ginning at 13 months of age. The best calving date should be 26 months to 28 months of age. The bred cattle have a strong production function, a good uterus environment, and a high conception rate, which is generally more than 50%. Nowadays, the grazing cattle have chosen sex to control the semen. There can be more mother-in-law, and as a reserve cow, there is a greater choice of advantages. Breeding of cows Due to milk production, adult cows have a lower conception rate than young cattle. Strengthening postpartum care can help improve the conception rate. Adult ovulation times are also later for young cows than for young ones. Ovulation time is not as regular for young cows. Be sure to grasp well, generally use the estrus middle follicles to determine the insemination time, generally do not advocate touching follicles before insemination. Luxury Scooter For The Old , High - End Luxury Scooter For The Disabled , High - End Luxury Electric Scooter For The Disabled jinan Fangqi Sunshine education consulting CO.,LTD. , https://www.fzrehabmarket.com