With the continuous improvement of people's living standards, the demand for dairy products and meat products has continued to expand, which has promoted the rapid development of domestic cattle breeding. There are more and more large-scale cattle breeding bases. How to accelerate the breeding and reproduction speed of cattle has become an urgent problem to be solved. Let's introduce how to use transgenic methods to accelerate the breeding and reproduction speed of cattle. The use of veterinary B-ultrasound machines can quickly detect the estrus of dairy cows and select the best estrus time. At the same time, real-time detection of cows after mating can be carried out to observe whether the breeding is successful and the number of fetuses can be detected. At the same time, reproductive diseases such as uterine inflammation, cysts, and hydrops of cows can also be diagnosed, prevented and treated in advance. It is an essential breeding and reproduction animal husbandry medical diagnostic equipment for large-scale cattle farms.

Transgenic technology for cattle. At present, transgenic technology is applied to dairy cows, mainly through transgenic animals to change the main components of milk and increase milk production. Through transgenic technology, dairy cows can produce new functions of peptides and proteins in the mammary gland that are important for synthetic drugs, that is, the core content of the mammary bioreactor is to use various transgenic technologies to efficiently express exogenous genes driven by mammary tissue-specific promoters in animal mammary tissues and produce target products in milk. At present, the main bioreactors developed include human coagulation factor, α antitrypsin, insulin, human albumin and interferon.

The research on preparing transgenic animals has been successful in mice, sheep, pigs, cattle and rabbits, but there are also certain problems in breeding. The key to its application in breeding lies in: the efficiency of transgenic technology, the understanding of the structure and function of some important genes of livestock, the acquisition of biological effects without harmful side effects, the stable inheritance of the transferred genes, and the establishment of homozygous transgenic animal breeding lines.

During the whole process of transgenic cattle, the animal B-ultrasound machine is used to detect the cows in real time, observe the physical condition and life characteristics of the cows, and greatly increase the probability of successful transgenic cows. Veterinary B-ultrasound machine has the following advantages

① The animal B-ultrasound machine can be used to observe the development of the uterus, embryonic sac and embryonic cell of early pregnancy in real-time in vivo images, with intuitive feeling and high accuracy;

② Simple operation and easy to master;

③ No damage to the body;

④ Early determination of pregnancy time;

⑤ Convenient diagnosis of early pregnancy for small animals;

⑥ Not dirty or tiring, and low cost per examination.

In addition, the accuracy and time of pregnancy diagnosis using veterinary B-ultrasound machines, such as rectal palpation, serum steroid analysis, biopsy, and estrus testing using vasectomized rams, were compared. Although other methods have their own advantages, the use of B-ultrasound for pregnancy diagnosis is a rapid, safe, effective, and timely method.