After raising the sheep in captivity, raising the lamb's lambing rate is one of the effective technical ways to increase the economic benefits of raising sheep without increasing the amount of basic ewes. There are five main types of commonly used technical measures:
First, increase the weight before mating
The weight of the ewe before mating is closely related to its fertility. Every 5 kilogram increase in mating weight can increase the double-knife rate by 9%. According to relevant unit tests, ewes less than 40 kilograms before breeding, estrus and fecundity rate of 68%, all producing single lamb; 40 to 61 kilograms or more, the conception rate of 73% to 100%, the lambing rate of 100% to 150% .
Second, exogenous hormone injection
When ewes are injected with multiple placenta, each sheep is injected with 1 ml of dilavin, which can increase the odds of ewes producing double lambs by more than 50%, especially for the ewes whose degree of improvement is not high.
Third, improve the nutrition of male and female sheep
Nutritional status has a great influence on the fecundity of the sheep, and the ewes are kept in the middle of the year for more than half of their lyrics, allowing them to develop normally. Therefore, it is necessary to strengthen the usual feeding and management of ewes to meet their needs for various nutrients. On this basis, short-term superior feeding should be implemented for the ewes before mating, which not only ensures that the ewes are normal, but also that the number of ovulation increases and the rate of twins is high.
The nutritional level of rams has a great influence on the conception rate and lambing rate of ewes. For this reason, in the sheep mating season, it is necessary to strengthen the breeding of male rams, and it is best to feed male rams with full-priced feed. Such rams have high sexual desire, high ejaculation, high sperm density, and strong vitality. Sheep's eggs are prone to fertilization and the twins rate is high.
Fourth, choose to stay more lambs
The number of lambs born to ewe is also related to heredity. It has been proved that the lambing rate is highest when the ewes of the three lambs or four lambs are used for breeding at the time of birth; the ewes of the two lambs are kept and the lambing rate is the second; the lambs of the one lamb are reserved and the lambing rate lowest. Therefore, we must choose to keep more lambs for breeding purposes.
Fifth, the use of multiple insemination
Timely infusion of multiple insemination is one of the ways to promote one child's prolificacy and increase reproduction rate. The sperm live in the ewes' uterus for about 9 hours. If the ewes row two or three eggs, they are not discharged at the same time. In order to fertilize the eggs, multiple inseminations can be performed in the middle and late stages of the ewes' estrus. Improve the conception rate. In production practice, methods such as repeated dispensing, double dispensing, and mixed semen insemination are often used. Actively performing artificial insemination can give full play to the role of excellent rams.
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