Purification and rejuvenation method of sheep and goat breeds

Abstract

The invention discloses a purification and rejuvenation method of sheep and goat breeds. The purification and rejuvenation method adopts a core group open type breeding method for establishing a core group and an underlying group among peasant households and realizes the transform from a small scale of the core group of conventional field construction, breed protection and breeding to a large scale of the core group of open type breeding established among the peasant households, fully reflects the breeding advantages of large core group, high frequency of elite genotypes, wide influence surface and wide radiation scope, and improves the production level of the breed protection and breeding group faster; the purification and rejuvenation method realizes the transform from the conventional field construction, breed protection and breeding with high maintenance cost and difficulty in long-term preservation of the core group to the dispersed establishment of the core group among the peasant households, with easiness in maintenance, long-term preservation and consolidation, fully reflects the advantages of large group and small breeding risk, and enables the development of the breed protection and breeding group to have a solid foundation; and the inbreeding coefficient of the open type breeding is slow in increase and difficult to cause the inbreeding depression phenomenon.

Description

technical field [0001] The invention belongs to the technical field of sheep and goat breeding, and in particular relates to a method for purifying and rejuvenating sheep and goat varieties. Background technique [0002] At present, the method used in the purification and rejuvenation of sheep and goat breeds is often used. It is a method of breeding for conservation and breeding. In the field, a core group of selection and breeding is established, and group closed-generation selection is carried out to cultivate high-quality breeding sheep for expansion and promotion. There are several problems in this method: (1) The size of the core group is small and the frequency of high-quality genes is low in the establishment of a field for conservation and breeding; The core group is not easy to preserve for a long time, and the risk of breeding is relatively high; (3) the establishment of a field for conservation and selection, adopts group closed-generation selection, and the inbr...

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Problems solved by technology

[0003] The present invention aims at the establishment of field conservation and breeding in existing sheep and goat breed purification and rejuvenation methods, the core group is small in scale, the frequency of good genes is low, the maintenance cost of the core group is high, the sustainability is short, and the core group is not easy to preserve for a long time , the risk of breeding is relatively high, and the group closed-generation selection is adopted, and the inbreeding coefficient rises rapidly with the increase of breeding generations, etc., a method for purification and rejuvenation of sheep and goat breeds is proposed

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