There are two purposes for the ranch to purchase the bovine semen: one is to be able to mate with the cows; the other is that the heifers who want to be born can help the ranch to profit after it is put into production in the future. In fact, it is the two basic requirements for the bull frozen sperm: the vitality of frozen essence must meet the required standards; the genetic quality of frozen sperm is excellent. The Ministry of Agriculture of the People's Republic of China stipulates that the vitality of frozen spermatozoa must be above 0.35, and that of the Shanghai Cow Breeding Center should be above 0.40. The most effective way to assess the genetic quality of bulls is to determine the descendants. It is not reliable to infer the son's genetic quality based only on the performance of the parents. However, only a few bulls in China have the ability to determine the descendants of the bulls. Only the purchase of outstanding bulls that have been determined by their descendants can guarantee the herd improvement. Paying attention to the survival rate and genetic quality of frozen sperm is the basic requirement for purchasing frozen semen. Specific to the actual purchase, you also need to consider comprehensively from many aspects. First of all, it is necessary to check which of the bull frozen sperm were used in the cattle. When buying a new bull jelly, it is necessary to pay attention to the genetic relationship with the original bull. This can control the excessive increase of the inbreeding coefficient. Second, analyze the defects in the herd and combine which traits have the most economic value to determine the traits that need to be improved. Avoiding inbreeding is only the first step, and the key is to make a decision to purchase the bull from the trait improvement. It should be noted that the selected modified traits should not be exhaustive, and it is generally advisable not to exceed four. For example, a ranch on the outskirts of Shanghai identified four traits that most needed improvement: milk production, milk fat percentage, limb and hoof, and somatic cells. They believe that in order to ensure a certain profit, the yield needs to be steadily increased. Since milk fat rate is negatively correlated with milk production, both milk production and milk fat ratio are selected for improved traits. At the same time, the body and foot disease in this herd is relatively common, and the percentage of the eliminated animals is relatively high. Therefore, it is also determined to be a priority improvement trait. Since the number of somatic cells in Shanghai will be included in the raw milk valuation system, the purchase price will be reduced if it exceeds the highest limit, and the price will be increased if the number of somatic cells is lower than the baseline. Therefore, the ranch also listed the somatic trait as a trait to be improved. Therefore, when selecting the bull, the ranch paid special attention to the genetic evaluation of the four traits. This also shows that the bull with the highest lifetime benefit index may not be suitable for the ranch. Third, in order to maximize the control of cryopreservative expenditures, the amount of frozen semen used to test bulls and young bulls can be used in a certain proportion. Generally, the former accounts for 70% and the latter accounts for 30%. It is well known that the price of frozen semen is verified. It is generally higher than the young bulls, because the identification of young bulls requires a lot of breeding costs. The cost of identifying a young bull in the United States is approximately $25,000. The cost of identifying a young bull in Canada is approximately $50,000. After identifying the results, they will eliminate more than 90% of the bulls, that is, less than 10% of the excellent verification of the sale of the bull frozen sperm to make up for the previous input, these inputs are measured by the descendants of the cost. The young bulls do not have post-test results and the price of frozen sperm is cheap. Although the price of semen using excellent bulls is relatively high, the benefits derived from the use of excellent bovine semen and the improved performance of dairy cows are definitely higher than those of semen. For example, if you use five excellent The frozen sperm of the bull can get a good daughter. If the cow has 3 times in total and the output of each fetus is increased by 300 kg, the income is much higher than the cost of frozen sperm. Therefore, the excellent verification of the frozen sperm of the bull should occupy the dominant position of the actual use of the pasture, so as to ensure the overall improvement trend of the herd. At the same time, the use of the young bull freeze in a certain range can shorten the interval between generations and accelerate the progress of heredity. In addition, there are two other principles that must be observed: the genetic quality of the selected bovine semen is higher than that of the herd; the genetic quality of the bovine semen purchased is now higher than that of the previously used bovine semen. In order to continue to improve the herd's genetic level, we must pay attention to every opportunity for improvement. Therefore, it is not easy to continuously improve the genetic quality of herds, and a wrong decision will unknowingly lead to regression of herd quality. As a qualified dairy producer, after setting the breeding goal for pastures, it is necessary to fully consider the above factors when choosing frozen sperm. With long-term adherence, genetic improvement will be effective. However, when the actual purchase of frozen sperm, some dairy farmers still have the misunderstanding of the understanding, such as the selection of the bull that the bull's flower is very important. This kind of consideration is completely unnecessary. Bull's flower (color) is not related to its production performance, body shape and other aspects. In order to improve the performance and body appearance of the herd, it is only necessary to consider the genetic evaluation of the traits of the bull, regardless of the distribution of the bull's flowers or the number of colors. In addition, many people think that the bull's impact on the performance of her daughter is greater than that of cows. This is unscientific. Half of her daughter’s genetics came from her father’s father and half from her mother. In terms of genetic composition, the influence of bulls and cows on their daughters is quite comparable. The reason why breeding of modern dairy cattle places special emphasis on the breeding of bulls is the widespread use of frozen semen artificial insemination technology. A bull can bear the task of breeding tens of thousands of cows each year. The excellent bulls are very good at improving the entire herd. important. In this sense, the influence of breeding bulls is indeed greater than that of cows. The decision to purchase the bull jelly may seem simple, but in fact the application of knowledge varies from farm to farm, and the same income from the final breeding investment will vary greatly. Other Class,Other Herbs,Something Else,Additional Herbs Henan Qiancuntang medicial technology co.ltd. , https://www.qctchineseherb.com