In Finland, private rainbow trout production is divided in two product sectors: production of large maturing fish whose highly valued caviar and fillets are both marketed (GROWTH-line), and production of large immature fish with high quality fillet (DELAYED MATURITY-line). To satisfy demand for these products, Finnish national breeding programme has one selection line selected especially for fast growth (GROWTH-line), and another line selected for delayed maturity age (DELAYED MATURITY-line). Here we show that after one generation of divergent selection, genetic gain in body weight of GROWTH-line has been 6%. Frequency of early maturing fish was 1.7 times lower in the DELAYED MATURITY-line. The results reveal strong favourable genetic responses to divergent selection of growth and maturity age.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 09.14, 2006
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