The author recently investigated 10 sheep raising households and co-existed 280 bantam sheep. It was found that there is a prominent problem that is that the rams are not changed for many years and the mating of close relatives is very serious. Most sheep are the natural development of the original group. Although these sheep are bred annually and reared year after year, due to the formation of a closed group, the kinship between the breeders is closely related, and the coefficient of the relatives of the herds continues to increase.
The fate of the "two drops and one high" is caused by the mating of sheep. Namely: sheep performance decline, variety degradation, stunting, growth retardation, the production of meat production decreased by 50%; reproduction rate decreased, due to inbreeding caused by freak, abortion, fetal growth, stillbirth, sheep disease resistance Poor, high mortality. These problems must cause the sheep farmers to attach great importance to take measures to seriously solve them. There are three main methods:
The first is to exchange rams in due course. After two years of continuous use, a male ram of a flock is exchanged with other rams of the same breed in other flock to achieve the purpose of reducing the inbreeding mating coefficient.
The second is to breed rams separately. In the season of breeding, artificial rams or artificial insemination are performed according to the rams whose kinship is far away. Adopting these two methods can not only avoid inbreeding, but also control the ewes lambing time and extend the useful life of the ram.
Third, in rural areas with large numbers of sheep and concentrated rural areas, an artificial insemination station for sheep should be established. The insemination station should establish a file system, including the male and female breeding lists, the lamb registration form, and the offspring measurement records. With these records, the kinship is clear, and it is possible to have a plan to select and match and avoid inbreeding.
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