Core abstract: 1. In the normal conditions of estrus identification and timely mating, the eggs that have just been excreted are more viable and energized. In general, the closer the timing of ovulation after insemination or natural mating, the higher the conception rate. This requires that the estrus identification of the ass be as accurate as possible in order to achieve timely insemination. The estrus identification of the female donkey is usually based on external observation.
1, make estrus identification and timely breeding
Under normal circumstances, the eggs that have just been discharged are more viable and energized. In general, the closer the timing of ovulation after insemination or natural mating, the higher the conception rate. This requires that the estrus identification of the ass be as accurate as possible in order to achieve timely insemination. The estrus identification of the female donkey usually focuses on rectal examination based on external observations. Rectal examination based on the presence of follicles, size, texture and other changes, to grasp the development of follicles and ovulation time to determine the most timely insemination time. In recent years, the implementation of insemination by means of the rectal grasp of the insemination method has been combined with the development of touch follicles to perform insemination, and the rate of conception of about 60% has been achieved.
2, strengthen the selection
Fertility is strongly influenced by genetic factors, and reproductive performance is also different in different breeds and individuals. Especially the male donkey has a great influence on the offspring. Therefore, the male and female donkeys with high fertility are the premise to increase the breeding rate of the donkey. For the selection of female donkeys, attention should be paid to a comprehensive inspection of their sexual maturation, morning and evening conditions, estrus status, puerperal spacing, abortion ability, and breastfeeding performance under normal feeding conditions. In the selection of the male donkey, attention should be paid to the herd’s genetic performance, appearance, reproductive history and breeding performance, and attention should be paid to the general physiological state of the donkey, the reproductive organs (the texture and size of the testis, epididymis, sperm discharge channels, and vice The function of the gonads, the quality of the semen (the vigor, density of the sperm, the morphology of the sperm) and the reproductive disease.
3, scientific feeding and management
Strengthen feeding and management, especially in the estrus seasoning season so that the female donkey has a proper degree of divergence, is to ensure that the female donkey normal estrus and ovulation material basis. Lack of nutrition will make the female emaciated, endocrine activities affected, sexual dysfunction, reproductive dysfunction, often appear non-estrus, quiet estrus, estrus, ovulation, ovulation decreased, etc.; male donkey performance poor semen quality, decreased sexual desire.
4, increase the number of female donkeys
The female donkey is the basis for the proliferation of the donkey. The greater the number of female donkeys in the donkey group, the faster the donkey breeds. Therefore, the rapid development of large-scale donkey breeding is the most effective way to increase the breeding rate of donkeys.
5, abide by the operating procedures, adopt the promotion of new technology
The promotion of artificial insemination techniques, especially the application of frozen semen, has greatly improved the level of production of donkeys that are used for breeding broilers. In the process of promoting artificial insemination technology, we must abide by the operating procedures, from the heat identification, cleaning and disinfection equipment, sperm collection, semen processing, freezing, preservation and insemination, is a set of very detailed and rigorous operation, all links closely. Poorly mastered in any one part can cause the consequences of mismatch and infertility. In order to improve the breeding ability of donkeys, appropriate and mature breeding techniques are gradually applied, such as estrus, embryo transfer, superovulation, controlled delivery, induced estrus, gender control, gene introduction, artificial insemination, embryo freezing and preservation. Proper use of reproductive hormones allows female donkeys with reproductive difficulties to return to normal reproductive function, thereby maintaining and increasing their fertility.
6. Conduct early pregnancy diagnosis to prevent misalignment.
Through the early pregnancy diagnosis, it can be determined early whether the female donkey is pregnant and treated differently. For female asses that have been determined to be pregnant, fetuses should be strengthened to ensure normal development of the fetus and prevent miscarriage of estrus after pregnancy. For unmarried female donkeys, we should carefully and promptly identify the causes, take appropriate measures, and compensate for opportunities without time loss.
7, reduce embryonic death and miscarriage
This problem involves a wide range and is also more complex. There are many factors that affect it. Early embryos that have not yet formed a fetus die in the ungrons of the donkey and die once they have stopped developing. They are usually absorbed by the uterus, while others are excreted in the estrus or urinated. Because the disappearance and discharge of embryos is not easy to find for people, it is called recessive abortion. The average abortion rate of donkeys is about 10%. Abortion occurs before and after 5 months of pregnancy. During this period, abrupt changes in feeding conditions are avoided, and reasonable exercise or physical activity is an effective preventive measure. It has been suggested that 300 mg of progesterone implanted subcutaneously 120 days after pregnancy may also be effective in preventing abortion.
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