Breed conservation, screening and breed production method in tilapia complete set lines as well as between two lines of complete sets

Abstract

The invention relates to a breed conservation, screening and breed production method in tilapia complete set lines, comprising the following steps of: construction of complete set line base populations rich in hereditary variation, establishment of operation procedures of family production and management in the complete set lines, marking of individuals in the complete set lines, genetic evaluation analysis of important production traits and establishment of individual mating selection programs in the complete set lines. The invention also provides a hybrid breed production method between twolines of complete sets, which is established by utilizing the method. The method disclosed by the invention has the characteristics of high pertinence, high selection breeding efficiency, capability of effectively preventing parent inbreeding depression of the complete set lines and the like; the harvest weight of the hybrid fine breed of tilapia is averagely increased by more than 30% than that of control groups; and the culture survival rate is also obviously higher than that of the control groups. According to the invention, a new technical approach is developed for cultivation of fish fine breeds; particularly a new selection breeding method is applied in the breed conservation, the screening and the breed production of the complete set lines in fish hybrid breeding; and the method isalso suitable for being popularized and applied in all cultured fishes and has broad popularization and application prospects.

Description

Technical field: [0001] The invention belongs to the field of animal breeding, and in particular relates to seed conservation, screening and seed production methods for mating lines of tilapia and two-line mating rooms. Background technique: [0002] In China, many experiments have been carried out in fish breeding since the 1960s, and there are 112 hybrid combinations of freshwater economic fish. Among them, Xingguo red carp has been selected for 5 generations. Its growth rate is 12.7% faster than that of unselected ones, and its fecundity and disease resistance are strong. It is also an important parent of carp hybrid breeding in my country. After 5 generations of selective breeding, purse red carp has fast growth, wide appetite and strong adaptability, and its muscle fat content is 2.5 times that of wild carp. Pengze crucian carp was bred in the 1980s after 7 years and 6 generations. Its growth rate is 50% faster than before the breeding, and 249% faster than ordinary cr...

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