Shrimp selective breeding method based on propagation expanding population

Abstract

The invention discloses a shrimp selective breeding method based on a propagation expanding population. The shrimp selective breeding method comprises the following steps that a core population and the propagation expanding population are constructed; excellent parents are selected from the core population and the propagation expanding population to serve as candidate parents; a genome genetic relationship matrix between the candidate parents is constructed; a mating scheme is designed based on the individual selection indexes of the candidate parents and the genome genetic relationship matrixbetween the candidate parents, and a next-generation core population is constructed; and the above process is repeated to finish selective breeding of multiple generations. By means of the method, the propagation expanding population is constructed, individuals with excellent performance are selected from the propagation expanding population to participate in breeding, the selection strength is high, the improvement amplitude of the genetic gain of breeding target characters is large, and the genetic progress is improved easily.

Description

technical field [0001] The invention belongs to the technical field of aquatic genetics and breeding, and in particular relates to a selective breeding method for shrimps based on multiplication populations. Background technique [0002] In recent years, my country's important cultured shrimp species, such as Penaeus vannamei, Penaeus sinensis, Macrobrachium rosenbergii, etc., have undergone artificial breeding and breeding for many years, and the degradation of germplasm resources has become increasingly prominent. The selective breeding technology system based on large-scale family lines has become the main means of improving most important economic traits of shrimp. The main features of this technical system are: each generation establishes a family of a certain scale, and after each family selects a certain number of individual physical markers, the mixed breeding is carried out for trait testing. Use pedigree and trait test data to evaluate and screen excellent familie...

AI Technical Summary

Problems solved by technology

Since most of the core breeding populations have been closed and selected for multiple generations, and the performance of important economic traits is excellent, the direct introduction of wild populations without genetic improvement to increase the genetic variation of the breeding population will reduce the performance of the core breeding population's breeding target traits

In addition, the introduction of foreign improved germplasm populations also has uncontrollable risks such as the introduction of unknown pathogens, so it is difficult to carry out the work of introducing foreign germplasm in actual breeding

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