Method for predicting and avoiding inbreeding degree in conventional breeding of macrobrachium nipponense

Abstract

The invention discloses a method for predicting and avoiding inbreeding degree in conventional breeding of macrobrachium nipponense, which comprises the following steps of: 1) dividing a built breeding basic group into a plurality of equal subgroups according to a breeding target, namely structuring the breeding basic group, and setting the number of the subgroups as c; 2) mating design of parents: mating the male and female parents in different subgroups in the step 1); and 3) predicting the maximum inbreeding coefficient of each generation inbreeding pair: assuming that only one pair of maleand female parents in each group of each generation generates offspring. The breeding basic group is structured, subgroups are established instead of families, ahuge technical difficulties caused byestablishment of families are avoided, economic and time costs are saved, and the method has very strong practical operability. Through the method provided by the invention, the inbreeding degree of each generation can be controlled by directly utilizing the quantity of the subgroups instead of the quantity of the parents which have genetic contribution to offspring, so that the genetic recessioncaused by inbreeding is overcome.

Description

technical field [0001] The invention relates to a new method for predicting and avoiding the degree of inbreeding in the conventional breeding of Macrobrachium japonica. Background technique [0002] Breeding techniques and methods of aquatic economic animals are the most important means to improve the production performance of cultured species. One of the most commonly used conventional breeding methods at home and abroad is individual selection. The method is purely based on the selection of the phenotypic values ​​of the individuals in the base population. Due to the advantages of simple operation, no need for individual marking or identification, no need to keep individual system records, and low economic cost, this method has become the most important breeding strategy used in Macrobrachium japonica breeding. Rapid genetic progress can in principle be achieved if the heritability of the breeding target trait is high; this approach is suitable for growth rate, morpholo...

AI Technical Summary

Problems solved by technology

Due to the difficulty of artificial insemination in Macrobrachium japonicus and the asynchronous mating between male and female parents, the establishment of a family is extremely difficult and difficult to maintain, and the cost is also extremely high. Therefore, the family selection strategy has not been implemented in Macrobrachium japonicus at present. It is also rarely used in aquatic economic animals. In the conventional breeding of Macrobrachium japonica, the existing technology has the problem of being difficult to estimate and control the degree of inbreeding

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