What should be paid attention to when using liquid nitrogen container frozen imported cow semen

  With the rapid development of the domestic dairy industry, the number of imported cows is increasing. The breeding problems faced by these imported dairy cows are not only related to the individual production capacity of dairy cows, but also related to the genetic quality of their offspring, and become one of the key factors affecting the overall economic benefits of the cattle. How to choose imported frozen semen from imported dairy farms and some problems in its use

  1. Formulation of liquid nitrogen container matching plan

  The matching program is at the heart of the entire herd breeding. The choice of semen must be based on the selection plan. With the acceleration of the global breeding process, people no longer only consider production traits, and the assessment of body appearance, combining ability, herd life, and somatic traits has been added to the work schedule. More experts recommend using bull records from different countries to rate bulls; this enhances the scientific nature of the work. In order to avoid the problem of inbreeding of cows around the world, increase the excellent genes of the herd and maintain its diversity, the following factors are worth considering for domestically produced dairy farms:

  1.1 Selection criteria For dairy cows imported from different regions, the exporting countries have different emphasis in the breeding process. According to statistics from the Ministry of Agriculture, cows imported from China are mainly based in the United States, Canada, Australia and New Zealand. The selection of Canadian dairy cows, while paying attention to production performance, strives to perfect the body shape. The breeding of American dairy cows highlights the production capacity and does not demand perfection. The breeding standards of the two have their own advantages, although the body shape is closely related to the production performance. However, the strict requirements on the body shape will make the individuals with high productivity not get the attention they deserve; and the pursuit of high productivity and relaxation The size requirements may affect the uniformity of the herd and the overall productivity, and may result in undifferentiated differentiation. In addition, for individuals, males should be complementary in size and individual size.

  1.2 The selection of individuals in the original exporting country refers to the system spectrum, and selects the ideal individual among the qualified bulls. Avoid the occurrence of inbreeding, avoid excessive mating between individuals, and reduce possible harmful mutations or mutations. According to the performance of the individual's domestic production capacity, make corresponding adjustments. Considering the appearance and production capacity of the offspring, considering the physiological conditions of the individual, the organic combination of the two is combined to maximize the benefits.

  1.3 The actual situation of the pasture The development of a reasonable matching plan should consider the geographical location of the pasture, the climate, and the production capacity of the dairy cows in the area. In the hot and rainy areas of the south, the individual yield is relatively low, and the milk fat percentage may become the main target for selection. The dry area in the north is an ideal place for dairy cows to grow, and it can provide comprehensive and high requirements for various production and body size indicators. However, do not pursue a production model that is too idealistic. The selection plan should be formulated with both long-term and short-term benefits in mind.

  

  2. Selection of imported semen from liquid nitrogen container

  The latest and recent years of North American dairy cows' annual identification results and domestic import standards, combined with their pedigree selection of bulls. In 1983, the International Organization for Standardization (ISO) issued the International Standard for Artificial Insemination of Animals - Frozen Bull Semen. The standard states that a bull must be a purebred species registered by the Livestock Breeding Association (Live Breeding Agency) or other competent authority. In special cases, hybrid bull semen can also be sold according to the requirements of the importing country, but the identification of the family and descendants of the bulls must be clear. In addition, the pedigree must be reliable and must be confirmed by blood group analysis. It also requires specific infectious diseases that are not regulated by the exporting country. In fact, the international trade in cattle frozen semen is subject to bilateral quarantine provisions in addition to supervision and inspection in accordance with international standards. Questions to be aware of:

  1 bull productivity; 2 herd production performance heritability; 3 bulls combined with other cows. This should be assessed on the basis of information provided by the exporting country.

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