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(I) Factors influencing fertility
1. Inheritance: We know that different breeds of sheep have some differences in their fertility. Sheep raised in pastoral areas in the north of China produce 1 lamb for 1 year, while Huyang and Hanyang can produce 2 or 2 for 1 year. With an annual output of 3 tires, it is also common to produce twin lambs, and as many as 3-4 lambs per litter can be produced. However, different breeds of goats also have some differences in their fertility. For example, green goats are more than 1 times higher than white goats and black goats. The difference in fertility of different breeds is the result of natural selection and long-term artificial selection.
2. Nutrition: The influence of the nutrient conditions contained in the diet on the fertility of the sheep is significant. Mass production practice proves that. Strengthening feeding is an effective measure to increase sheep's fertility. In order to grasp sheep gras all year long, ewes should be fed for a short period of 2-3 weeks prior to breeding of the sheep to increase the ovulation number of the ewes. During the sheep’s gestation period, the weight of the ewes should increase by 10%-15%, and the increase is generally increased in late gestation ewes. If the ewes are poorly fed, poor nutrition, and insufficient vitamins, this will greatly reduce the number of ewes in the ewes, thus affecting the sheep's conception rate and lambing rate.
3. Temperature: When the summer weather is hot, due to the high temperature, some species of ram have complete infertility or reduced fertility. The ram mainly shows less ejaculation, less sperm, low sperm motility, and deformity. The proportion of sperm or dead sperm increased. Temperature has less impact on goats and greater impact on sheep. For example, Khalid’s sheep and Lincoln goats will increase dead sperm when the outside temperature reaches 30-3412 in summer and August.
4. Age: Lambing rate of ewes generally increases with age. Ewes have the highest fertility when they are 3-6 years old. The ram's fertility is generally peaked at 5-6 years old. Male and female sheep have reduced fertility from 6-7 years of age.
(II) Measures to increase sheep breeding power
1. Careful feeding: The effect of dietary nutrient conditions on the fecundity of the sheep is obvious. For this reason, grasping the sheep lice all year round can not only make the ewes neat, but also increase the number of ovulation. Therefore, before the breeding of the sheep, the ewes should adopt short-term excellent feeding to increase the number of ovulation and increase the rate of double lambs. At the same time, the level of nutrition of the rams has an important impact on the sheep's conception rate, lambing rate, birth weight and weaning weight. Feeding male rams with full-priced compound feed can significantly increase the conception rate and lambing rate of ewes and increase the birth weight of lambs. To this end, it is one of the important measures to improve sheep's fertility by improving the nutrient conditions of the sheep and implementing careful feeding and management.
2. Increase the proportion of ewes of the appropriate age in the flock: In the flock, the proportion of ewes of the appropriate age in the flock should reach more than 60%, which is an effective and important measure to increase the fecundity of the sheep. Judging from the current production structure of sheep around the country, the proportion of yak sheep is too high, especially for sheep farms raised by mountainous farmers. More sheep, a small proportion of ewes, it is not conducive to improving sheep's fertility. Although the sheep can cut hair
Fleece, but after slaughter must be slaughtered or slaughtered, otherwise the weight of sheep after winter will be significantly reduced, resulting in feed, manpower, grassland and other aspects of waste, it will directly affect the further improvement of the efficiency of sheep. Raising the proportion of ewes at the appropriate age and increasing the number of ewes of the appropriate age will significantly increase the fecundity of the herds, increase the number of herds and increase the economic benefits. At the same time, the oldest ewes older than 6 years old in the flock are eliminated in time. At the same time, reserve ewes are added to keep the number of ewes in the sheep at an appropriate proportion.
3. Pay attention to the selection of many lambs: We know that there is a close relationship between the lamb's lambing and herds' genetic performance. It has been proved by practice that the offspring of the breeding ewes with a high rate of double lamb production will have a significantly higher chance of producing double lambs, and this will also have a certain effect on improving the fecundity of the herds.
4. Timely elimination of infertile sheep: To inspect the ewes who are not pregnant at the appropriate age, we must find out the causes of infertility and resolve them in a timely manner. For ewes who are still infertile after entering the second year of ewes, Need to eliminate processing. This is because the ewes who were infertile after the first year of distribution have a higher rate of infertility during the later period of their mating. The ewes of the firstborn who produce dead lambs also have a higher proportion of dead lambs produced in subsequent fetuses.
In recent years, with the continuous advancement of science and technology and the promotion and application of artificial insemination, superovulation, and embryo transfer technology, various regions have created a new way to speed up sheep breeding.
Analysis of Factors Influencing Sheep Breeding and Countermeasures
In the production of sheep, the high and low fecundity of sheep not only relates to the rate of conception and the survival rate of litter of the sheep, but also directly affects the improvement of the production efficiency of the farmer's raising of sheep. Therefore, raising sheep's fertility is the majority of sheep farmers. An important measure to achieve efficiency gains.