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For more than 20 years, the world sheep industry has developed into a world-wide age of mutton sheep. It is gradually changing the traditional way of relying on wild sheep breeding, using advanced scientific methods to organize and manage sheep production to increase its production efficiency and commodities. rate. The ultimate goal of the production of mutton sheep is to provide the society (market) with the highest number of quality mutton products. Rapid propagation is an important means of achieving this goal. The lamb raising technology of cotton goats developed by the Lanzhou Institute of Animal Husbandry and Veterinary Medicine at the Chinese Academy of Agricultural Sciences can increase the lambing rate by 20% to 50%, which is the most important technical means for rapid propagation at home and abroad.
Second, the technical characteristics and superiority of the use of drugs to produce multiple births is mainly used maternal serum or its extract FSH, directly through the blood after injection in the gonad (ovaries) to accelerate the development and maturation of follicles to make multiple ovulation More pregnancy. This method was invented by the sheep breeders in the Soviet Caucasus in the 1930s. It is mainly used for the production of lamb skins of Karakul sheep, ie the production of Persian lambskin. However, it is not suitable to produce multiple live lambs. After 1950, scientists explored a new method to use steroid immunization to regulate the feedback activity of the hypothalamus-pituitary-gonadal axis, weakening and postponing the occurrence of negative feedback so that positive feedback can be continued and accumulated to enhance Pituitary function, so that the follicle continue to mature and reach the purpose of multiple ovulation, multiple fetuses. Its characteristic is that it does not produce too many eggs outside the physical capacity, only one egg is placed in its physical capacity, and one more lamb is added. This method only raises the twinning rate for single fetus and does not produce triple fetus; for twin fetus, only three fetuses are added, and four fetuses do not occur; for the third fetus, only four fetuses are added. Five fetuses do not occur. Row one egg and increase one child's conception. The proportion of productive lambs is related to two factors: one is the inheritance of the ewes gestating the ovaries, that is, multiple fertility, and the other is the environmental condition that is the rearing level, ie the weight. Combining the two is the basis for the natural lambing rate of the flock. The high natural lambing rate of the sheep reflects the high polyzoa and feeding conditions of this group of sheep, and the higher the lambing rate is, the higher the lambing rate is. The features and advantages of this technology are mainly manifested in the following aspects:
1. The application of this technology can increase the lambing rate by 20% to 50% on the basis of the original lamb's lambing rate, and does not cause stillbirth and miscarriage. All of them are live lambs. At the time of weaning, twin lambs and single lambs weigh very close. Under better feeding conditions, there is basically no difference in body weight between single and twin lambs. There are no more advanced high-yield technologies at home and abroad.
2. In the existing sheep group, the product can be increased by 20% to 50% without increasing input. This not only saves costs, but also increases the slaughter rate and commodity rate, and speeds up cash flow.
3. When the sheep's products in the market need to be stable, the amount of basic ewes fed can be reduced by 20% to 50%, and the same output as the previous year can be obtained. Grazing sheep can reduce the pressure on the grassland pastures, reduce the degree of desertification, and is conducive to the restoration and regeneration of pastures. Feeding sheep can greatly reduce the cost of feeding.
4. The application of this technology is simple and easy. No professional technicians are required to operate, no special equipment is required, and space restrictions are not imposed on the site. Employees or farmers and herdsmen can self-inject subcutaneously to achieve the effect of increasing the lambing rate, and they are easy to implement in production.
5. In order to speed up the propagation of improved varieties, the technique can be implemented based on the reproduction speed in natural conditions, such as one-year production, two-year three-year production, or two-year production, and the effect of increasing the lambing rate can be achieved. Frequency breeding must be based on higher feeding conditions. It is not necessary to spend a high price on the embryo transfer, and can enjoy the results or benefits of expansion, and it can save the cost of feeding and management of the recipient sheep in embryo transfer and the occurrence of dystocia. Expanding the breeding rate by 20% to 50% can greatly speed up the breeding process of mutton sheep.
III. Significant effect of technical application We have conducted production trials in Xinjiang, Inner Mongolia, Zhejiang, Hunan and other 12 provinces and autonomous regions from 1987 to 1992. Xinjiang Maoxi sheep, Nongchi fine wool sheep, Tibetan sheep, Altai sheep, Gai county goats, Hebei plate The 1.29 million ewes of 9 breeds, including goats, increased by 305,800 lambs, and the average twin rate was 23.7%. The lowest is that the land sheep of Gansu Licharushi increased the twin-pregnancy rate of only 15% to 17%, among which a group of more than one hundred ewes only increased the twin birth rate by 11%. The better effect was in Shihezi, Xinjiang, where nearly 100,000 ewes increased by 40%, plus its original 20% twin-pregnancy rate, reaching a twin birth rate of 60%. The overall effect is that the fine wool sheep and goats in Xinjiang have improved above average. After statistical analysis of the data from the above production trials, it generally shows some rules: For single-fat ewes, it can have the potential to control the breeding of ewe's own twins, twins, and twins, and raise ewe. The rate of double lambs does not appear as three lambs or four lambs. The effect of immunization is to increase the double lamb rate by 20 to 50 percentage points based on the natural lambing rate of the sheep itself. Excellent feeding conditions, better results. Taking sheep as an example, hens weighing more than 40 kilograms during breeding can increase the double-knuckle rate by more than 20 percent; hens above 50 kilograms can increase the double-knocking rate by more than 30 percent; more than 60 kilograms The ewes can increase the rate of double lambs by more than 40 percent. The higher the natural double lamb rate of ewes, the greater the increase in the rate of double lambs after immunization. The ewes that have a 5% natural double-breasted rate can increase by more than 20% to reach more than 25% of the double-knuckle rate; the ewes themselves with a 10% natural double-breasted rate can increase by more than 30 percentage points. More than 40% double-breasted rate; ewes with 20% natural double-breasted rate, can increase 40 percent or more to reach more than 60% double-breasted rate; ewes with 30% natural double-breast rate can Increased by more than 50 percent and reached more than 80% of the double lambs rate. So on and so forth. The ewes themselves, which are twin breeds, can produce three lambs after injection; the ewes of the third breed can produce four lambs. The lambs added are all that the ewes can conceive and nurse. In general, stillbirths and abortions do not occur. The higher the natural lambing rate of the ewes, the greater the increase after immunization.
Author: Lanzhou Institute of Animal Husbandry and Veterinary Medicine, Chinese Academy of Agricultural Sciences
Selenium
is an indispensable trace element to maintain the normal function of
the human body. Selenium deficiency in the human body can lead to
various diseases. Modern scientific research
proves that selenium has anti-oxidation, enhances human immunity,
effectively removes harmful garbage, promotes human health, and delays
aging.