1 The purpose of the winter cold cattle allocation in the past is limited to the warm season of April-October. People think that winter is not suitable for cold and winter mating in autumn and winter in the coming winter. Yak is not well fed and growth is slow. Therefore, the cows that make the estrus in winter can not be timely bred and artificially create half an empty space, which slows the breeding of cattle. Practice has proved that adhere to the constant cold all year round, there are estrus cows at any time led to the insemination station (spot) breeding, one is to enhance the cattle farmers to support the improvement of confidence, and second, can effectively resist and eliminate the breeding mating species Existence and development, the third is to greatly strengthen the application of improved varieties of local cattle process, and quickly improved the quality of herds and increased the economic benefits of cattle. 2 Technical Tips for Winter Cattle Cold Distribution In addition to following cold cattle perennial cold cattle technical allocation, the focus is on the following two aspects of insulation and operation: 2.1 Winter breeding, defrosting, and insemination must be in place. Insulation conditions in the room, the operating room and infusion room to ensure that the air is fresh and sealed. At the same time to have heating equipment, 10 to 20 minutes before insemination temperature should reach 10 °C or more. 2.2 Because the temperature is low in winter and the water temperature drops rapidly, it is necessary to ensure that the temperature of the thawed semen after preheating the thawed solution for 1 to 2 minutes is 1 to 2°C (appropriately 42°C) higher than usual (summer). 2.3 Apply warm water during operation. Due to the cold in winter, if cold water is used, the rectum of the cow is subjected to cold stimulation, and it is easy to cause irritability and inconvenient operation, thereby affecting the insemination effect. 2.4 It is better to use a glass insemination device during winter insemination. Before and after the semen is absorbed by semen, it is best to wrap it with a sterile hot towel to prevent cooling. 2.5 When semen is sucked, semen should be sucked in the front of the tip of the spermatorrhea. When insemination, the front half of the tip of the spermatozoa should be inserted into the deep part of the bovine vagina. This can prevent the semen from being exposed to the outside of the vagina when it is lost. Warm, causing sperm death. 2.6 winter breeding, the important thing in the operation process is to do four fast, that is to take fast, thawing fast, quick microscopy and insemination fast. 3 Effect of winter cold cattle allocation 3.1 Accelerating the speed of improvement and shortening the interval between generations According to surveys, winter empty cows account for 57.44% of breedable cows. In the winter, 44.84% of the empty cows were estrus-matched, while the winter pregnancy rate was 3.04 percentage points higher than that of the summer cows. Winter cow production accounted for 39.09% of winter empty cows, which means that more than 39% of cows per year have their calving interval shortened by 4 to 5 months. 3.2 Cost savings and improved equipment utilization Since the estrus cows in winter are mostly young and healthy cows, the estrus cycle and duration are relatively normal, and most estrus cows inseminate once to achieve abortion, reducing the number of re-uses and saving Semen dose. In addition, due to the low winter temperatures, the consumption of liquid nitrogen is relatively reduced compared with the summer. From the pilot point of view, the average consumption of liquid nitrogen in the summer was 0.57 litres in the summer and 0.44 litres in the first winter, and consumed 0.13 liters less. 3.3 The development of winter yak is not affected. According to surveys, there is no significant difference in the growth and development of yaks produced in winter compared with perennial breeding. As long as the husbandry and management are strengthened and appropriate feeding is done, the yak produced in winter will be fully developed. 3.4 Economic Benefits 1 Increase reproductive survival rate and increase income. According to the city's statistics, the winter cows communized with 3,570 live yak heads, and for 18 months, they were calculated based on the average net value of 500 yuan per head. The city's winter cold cattle has increased by 1.87 million yuan. 2 Improve equipment utilization and save expenses. With the winter savings of semen and liquid nitrogen total benefit of 07,600 yuan. Among them, winter allocation of semen 2136 tablets, each calculated according to 3.00 yuan, saving liquid nitrogen 0.12 million; winter matching head number is equal to the number of summer 14 stations (points) to each station (point) equipment and equipment costs 1 In thousands of calculations, the cost savings are 14,000 yuan. The total amount of total benefits of 1,806,600 yuan was calculated for the winter cooperating meter. 4 Conclusion 4.1 Winter cattle cold allocation technology is practical, efficient, easy to promote, without adding large equipment, but also saving precision, liquid nitrogen, yak growth and development is not affected, is an increase of cold matching "three rates", tap the mother The main technical measures for the potential of cattle production should be vigorously promoted in the production practice. 4.2 Due to the low winter cold temperatures, winterization has two key technical problems: one is the insulation and cold protection technology, and the other is the insemination operation technology. The insemination stations (spots) should perform insulation work to ensure the quality of semen after thawing. 4.3 In order to promote the application of winterization technology in large areas quickly and create greater social and economic benefits, business departments at all levels should strengthen technical training, popularize winter allocation technology, and promote faster development of cattle cold allocation.

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