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.
First, the factors affecting fertility
1, genetic
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 sheep and Han sheep can produce 2 or 1 for 2 years. The production of double lambs is also more common, and as many as 3 to 4 lambs per litter can be born. 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 the sheep's fleas all year round, the ewes should be given short-term excellent feeding 2 to 3 weeks before the sheep's breeding to increase the ovulation number of the ewes. During the gestation period of the sheep, the weight of the ewes should increase by 10% to 15%. The increase of the ewes is generally increased in the later stage of 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
In hot summer weather, due to high temperatures, some species of ram have complete sterility or reduced fertility. Rams are mainly characterized by low ejaculation, low sperm counts, low sperm motility, malformed sperm, or dead sperm. The proportion increased. Temperature has less impact on goats and greater impact on sheep. For example, Cowley sheep and Lincoln sheep will cause dead sperm to increase when the outside temperature reaches 30 to 3412 in the summer of July and August.
4, age
Lambing rate of ewes generally increases with age, and ewes have the highest fertility when they are 3-6 years old. The ram's fertility is generally peaked at 5-6 years of age. Male and female ewes have reduced fertility from 6 to 7 years of age.
Second, improve the sheep's fertility response measures
1, carefully feeding
The effect of nutrient conditions on the fertility 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 percentage of ewe in the flock
In sheep, 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 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 shear 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, aged ewe older than 6 years old in the flock were 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 choose to stay more lambs
We know that there is a close relationship between the number of litters produced by the ewe and the genetic performance of the sheep. 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 ewes that are not pregnant at the appropriate age, we must find out the causes of infertility and resolve them in a timely manner. For ewes that are still infertile after entering the second year of ewes, they must be eliminated. 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.
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