The male and female rams that are reserved for breeding are generally selected to meet the breed characteristics and have outstanding performance.
Pre-breeding sows and escaping ewes should take short-term excellent feeding 15 to 25 days before mating, supplementing 0.2 kg to 0.5 kg of concentrate each day. Feed supplements are mainly energy feeds, such as corn, sorghum, wheat, etc. Through the short-term raising to increase the lyrics, according to the experiment, for each increase of 1kg body weight, the lambing rate is expected to increase by 2.1%, and the estrus is orderly and the lambs are concentrated.
Whether or not the proportion of goats is appropriate for the structure of the flock is very reasonable, which has a great influence on the growth of the sheep. Therefore, the percentage of breeding ewes in the flock should be increased. Generally higher than the second production of ewe production double lamb rate, therefore, the 4 to 6-year-old ewes should account for 50% of the total number of sheep, to timely eliminate more than two production single lamb ewes.
Timely mating ewes each estrus time is 24 hours to 40 hours, and ovulation more than 30 hours to 34 hours after the onset of estrus, so the breeding time should be selected 12 to 24 hours after estrus, this time the conception rate is higher. The initial mating age of the ewe (bred sheep) should be 7-8 months of age or 50%-60% of the standard weight of this sheep's ewes, and the initial age of rams should be 1.5-2.5 years. Regardless of the ram's ewes, the initial allocation time cannot be premature, otherwise it will reduce the service life.
Scientific mating varies according to the age of the ewes, and the timing of mating is not the same. Old ewes have short estrus duration and should be bred in time after estrus. Young ewes have a long estrus time, and breeding time can be later; medium ewes have moderate estrus time, and breeding time is controlled by old ewes . This is what the old saying goes, "It's old, it's late, it's not old, it's not small."
Drug aphrodisiac breeding For superovulation of ewes, equine maternal serum 600 to 1100 IU can be injected subcutaneously on the hen's hind leg 13 days or 14 days before estrus. After 3 to 4 days of estrus, or On the day of breeding, once again intravenous injection of choriogonadotropin 500 to 750 IU, can achieve the purpose of superovulation, timely insemination and breeding, can greatly increase the lambing rate.
Repeat breeding In order to increase the rate of quasi-typhoid and multi-rabbit, two breedings can be conducted during the middle and late stages of estrus, with interval of 6 hours to 12 hours; or in different periods of one estrus period, with 2 to 3 rams. Once; if artificial insemination is used, two inseminations can also be performed.
Timely Elimination of Infertile Sheep Ewes who are infertile during the first year should be examined promptly to find out the reasons for treatment. If the second year of breeding is still infertility, it should be eliminated in time. Infertile ewes who mated in the first year also had higher rates of infertility; the number of ewes that produced dead lambs in the first year was higher.
Embryo transfer Embryo transfer is the technique of superovulation. A large number of fertilized eggs are obtained from high-quality ewes. They are transplanted into the ewes that have the same level of estrus, but have lower performance, and are improved by the method of “pregnant womenâ€. Excellent ewes fertility.
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