First, grasp the breeding season of sheep, do a good job of estrus identification, and timely breeding.
The breeding season of sheep is generally in the spring and autumn. In recent years, after long-term artificial selection and cultivation, the sheep in the plains of the plains have ample climate due to the warm climate and sufficient fodder foraging. The seasonality of the estrus is not so obvious. estrus. However, the estrus of sheep in the cold regions still has obvious seasonality. In the breeding season, we must do estrus identification, discover estrus sheep in time, master good breeding or insemination time, and prevent mis-matching, miss-fitting, early-matching, and late-maturing so as to improve the conception rate. The best insemination time of the sheep is usually in the late estrus (estrus 12 to 16 hours), but since the sheep's estrus duration is short, the estrus is usually found in the morning or in the morning, and the insemination (this time) is performed once in the morning and then in the evening. Insemination (the present) once, found estrus in the afternoon or evening, when the insemination (the present) once, then the next morning insemination (the present) once. The key to insemination is the strict observance of the operating procedures, careful and light movements, accurate insemination, and better quality of the semen.
Second, scientific and rational use of breeding rams.
According to the production needs, select the appropriate species of ram, in order to improve the quality of the sheep and production performance but also to select the species of male and female ram, we must scientifically and reasonably allocate and equip ewes for each ram. Before ewes are bred to check the semen quality of the rams, select rams that meet the characteristics of the breed, have a strong libido, high semen density, and good vibrancy. Gradually increase the amount of ram movement and concentrates in the month before mating. Feeding quantity, the feed not only needs to increase the amount of digestible protein, but also pay attention to the addition of trace elements and vitamins. It is best to feed a certain amount of carrots every day. The ram's lyrical condition should be in the middle and upper grades. Over-fat or too-lean rams will affect the conception rate.
Third, strengthen the feeding and management of ewes, and increase the number of ovulation and conception rate of ewes.
Ewe's lyrics affect the ewes’ estrus, ovulation, and conception directly. Ewes must maintain the sensation of estrus in the estrus season, ovulation number, egg quality, and conception rate. Therefore, it is very important to strengthen the feeding and management of ewe, and it is very important to increase the conception rate of ewe. One or two months before the breeding, the ewe can be fed for a short period of time, and the amount of full-priced compound feed can be increased appropriately. The sheep will restore their physique as soon as possible and welcome the breeding. At the same time, we must also strengthen the feeding and management of pregnant ewes so as to increase the number of ovulation and the conception rate of ewes.
Fourth, strict implementation of artificial insemination technical operating procedures.
If artificial insemination technology is used to breed the sheep, strict observance of the operating procedures, attention to disinfection of the equipment, careful and lightweight movements, accurate infusion site, it should be noted that after the insemination device is cleaned and disinfected, if it is not dried Or rinsing with normal saline, moisture adhered to the inner wall of the inseminator can reduce the osmotic pressure of the semen, thereby affecting the conception rate.
Fifth, prevention and treatment of reproductive tract diseases, improve the ewes conception rate.
The reproductive tract diseases of sheep mainly include follicular cysts and endometritis.
1. Follicle cysts. It means that the follicle is over-developed in the ovary and does not ovulate. The ewes have obvious estrus performance and persist for a long time. Their clinical manifestations are "mushroom madness". The treatment can use human chorionic gonadotropin (HCG) or luteinizing hormone (LH).
2. Endometritis. Mainly due to insemination and sterilization is not strict, pay attention to disinfecting during childbirth midwifery, or careless operation, will bring harmful microorganisms into the uterus, causing uterine infection. Ewes suffering from chronic endometriosis do not generally exhibit systemic symptoms, and their estrus cycle is normal, but they are often infertile or have early embryonic death, reducing the conception rate. Treatment can be done with uterine irrigation and antibiotics applied to the lining of the uterus. Therefore, from the details of ewe mating, childbirth and other operations, attention should be paid to the prevention and treatment of obstetric and genital tract diseases. Eliminating ewes that have no therapeutic value must be resolutely eliminated, which is of great significance in improving the conception fertility rate.
Sixth, do a good job of deworming and epidemic prevention, prevent the occurrence of disease and affect the conception rate of ewe.
Prior to breeding, ewes must do a good job of deworming and epidemic prevention, avoid the occurrence and spread of infectious diseases and parasitic diseases, cause devastating losses to the flock, and affect the economic benefits of the sheep industry. Ivermectin is usually used as the weight for insect repellent, and triple prevention, “five disease†epidemic prevention can be performed, and epidemic prevention procedures suitable for this field can also be formulated according to the epidemic characteristics of the local epidemic. It should be noted that anthelmintic drugs and vaccines must be manufactured by reliable manufacturers, transported and preserved as required, and injected in accordance with the instructions for use; the interval between each epidemic prevention or insect repellent should be at least one time.
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