How to reproduce ewes without estrus? breeding techniques of ewes

Sheep is a very common animal in our life, in fact, sheep is also divided into male and female, so that it can be conducive to its reproduction. Nowadays, there are also many people raising sheep, but when raising sheep, some people may encounter the situation that ewes are not in estrus. So how should I feel about it? If you want to know more, let's look down together.

What if the ewe is not in estrus?

The main results are as follows: 1. One month before mating, proper supplementary feeding can improve the nutritional level of ewes, especially protein feed, which can promote estrus and ovulation and induce ewes to give birth to twins. It is reported that under the condition of poor body condition of ewes, for every 1kg increase in ewe weight before mating, the ovulation rate increases by 2%-2.5% and the lambing rate increases by 1.5%-2%. A more balanced and full-price nutrition level will facilitate early estrus of young ewes, and will also make normal ewes normal estrus and ovulation. If it can not meet its nutritional needs, not only can not normal estrus and ovulation, but also ewe estrus duration and sunny cycle are not normal.

2. Light is one of the main reasons that affect ewe estrus. Sheep are short-day seasonal estrous animals, the light is shortened, the reproductive function of ewes is excited and exuberant, and ewes are in estrus. On the contrary, prolonged light time will inhibit ewe ewes' estrus.

Breeding techniques of breeding ewes

1. Feeding techniques in the early stage of breeding ewes: the early stage of breeding ewes can also be called empty period. Ewes in this period do not have the burden of pregnancy and breast milk secretion, as long as they simply catch fat and rejuvenate. Because the main purpose of raising and breeding ewes during this period is to prepare for breeding. As long as the breeding ewe reaches full fat before mating, it can improve the fecundity and conception rate of ewes.

2. Feeding techniques of breeding ewes during pregnancy: the pregnancy period of ewes is a total of five months, so pregnancy can also be divided into early pregnancy and late pregnancy. The first trimester of pregnancy is the first three months of ewe pregnancy. During this period of time, the development of the fetus in the belly of the ewe is relatively slow, so don't feed too much, just keep the normal level. However, we should pay attention to the supplement of vitamins, trace elements and minerals. The late pregnancy of ewes refers to the two months of prenatal ewes. During this period of time, it is crucial to strengthen the feeding of ewes and to supplement adequate nutrition for ewes. Because during this period of time, not only the ewe itself is in great need of nutrition, but also to ensure the nutritional needs of the fetus. At this time, the fetus develops rapidly, bones, muscles, skin and viscera and other organs are growing, nutrition is naturally indispensable.

Technical measures to improve the fecundity of ewes

1. Ovulation control. Including the control of ovulation time and the number of ovulation. Estrus ovulation is regulated by hormones, and the application of hormone preparations can control the time of ovulation. Gonadotropin-releasing hormone analogues, such as ovulation induction No. 2 and ovulation induction No. 3, are generally used 8 to 10 hours before ovulation after estrus. Human chorionic gonadotropin can also be used, this technique is conducive to regular artificial insemination, and reduce the trouble of estrus identification. The control of the number of ovulation includes the control of twin ovulation, twins and superovulation. Superovulation is used for embryo production of donor cows.

2. Control of proestrus. Through nutritional means or hormone treatment, ewes can come early in proestrus, achieve sexual maturity and mating weight, mate and breed earlier, and increase the number of lambs in ewes. For example, through strengthening the feeding and management of the non-horned Merino sheep in Fuxin Guanshan Sheep breeding Farm, the weight of the female lamb reached 40 kg in autumn, mated in September of that year, and gave birth the following year, one year earlier than the normal 18-month-old breeding. For sexual immature young ewes of a certain age, gonadotropin treatment (such as follicle stimulating hormone, or pregnant horse serum gonadotropin) can make their estrus mating and conception.

How to prevent milk deficiency in ewes

Ensure adequate nutrition and feed mainly with grass. The feed of sheep should be based on grass and properly supplemented with concentrate. Dietary roughage should be no less than 60% and concentrate no more than 40%. And follow the five principles:

1. Miscellaneous. The feed should be rich and varied, and the green, coarse and fine materials should be matched reasonably. There are 5 kinds of green fodder, roughage and mixed concentrate fodder (including 2 species of Leguminosae), 2 species and 3 kinds of mixed concentrate respectively.

2. Quality assurance. Feed quality is good, fresh, forage grass can not bring dew (rain, etc.).

3. Enough. Each adult sheep has 4 kilograms of green feed, 1 kilogram of roughage and more than 0.5 kilograms of mixed concentrate per day.

4. Complete nutrition. The crude protein of the diet should reach 10%-14%, the crude fiber should be controlled within 20%, and mineral feed (or licking bricks) should be added to the diet.

5. The supply is stable. The supply of green and roughage should be balanced throughout the year, and the change of feed should be gradually transitional from less to more.

Ewe non-estrus is generally related to light, nutrition and other aspects, so if you want to solve the problem, you need to strengthen these two aspects of measures. Ewes need to pay attention to when raising ewes, and the nutrition needed in different periods is also different.