At the time of breeding, the average number of days of small-tailed Han sheep pregnancy is 148 days, and most ewes can be estrus in more than 40 days after childbirth. This can be 2 years or 2 years and 3 months in 1 year.
Distribution arrangements Small-tailed Han sheep in spring and autumn estrus is more concentrated, so 1 year 2 children can be breeding in March-April, 8-9 months of lambing; 9-10 months of mating, the following year in February-February can produce a second child. Lambs that have been produced for 2-3 months are in the season of grassy weaning, which is conducive to the cultivation of reserved sheep. After the weaning of the lambs from August to September, after being weaned, it is a good opportunity to supply lamb meat to the market in winter. The sheep with 3 years of 2 years can be bred from August to September, and lambs are born from January to February. The breeding season is from March to April. The lambs are born from August to September. The breeding season is from October to November.
The ewe's approach is to use rams to find ewes in order to find the estrus ewes correctly. Because the ewe's heat is often not obvious, it usually manifests itself as eating anxiety, love calling, flushing and swollen vagina. The test is to use rams that are not suitable for breeding and strong sexual desires as a lover. They are put into the ewes every morning and evening during the breeding season to find and determine the ewes as soon as possible. Put the ram into the ewes group, when they sniff the ewes or use their hoofs to tease the ewes, the ewes will be estrus when they stand still or actively approach the rams.
Breeding techniques for ordinary farmers, the use of Natural law is easier to save. However, a ram can only be equipped with 30 to 50 ewes in one breeding season. If artificial insemination is used, 300 to 500 ewes can be allocated.
Secondary Breeding Because of the short estrus time of the ewes of the Small Tail Han sheep (usually about 30 hours), the survival time of the evacuated eggs is also shorter, and some ewes have inconsistent maturation time, so the mating or loss of the ewes is 1 time. The accuracy of precision fetuses is low, and it is difficult to engage more eggs in fertilization. By using the second mating method, sperm with fertilizing ability can be maintained in the genital tract of the ewe, increasing the chance of fertilization. The following methods are commonly used in production: For ewes who are confirmed to be estrus, insemination is performed once and after 12 and 24 hours, and the interval between two inseminations is usually 10-12 hours, which can effectively improve the conception rate of ewes.
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