Breeding effects of Cyprinus carpio F2 generation pedigrees in Guangxi

ObiectiveThe present study was conducted to evaluate breeding effects of Cyprinus carpio F2 generation pedigrees in Guangxi in order to lay a foundation for breeding new C. carpio varieties that are suitable for local environment.MethodBest linear unbiased prediction(BLUP) was adopted to evaluate breeding values of 60 F1 pedigrees. 71 F1 generation selected strains(A1-A71) and twenty control families(B1-B20) were selected. These strains were marked with passive integrated transponder(PIT) and cultured in the same pool for 320 days. Growth traits of F2 generation pedigrees were measured later, and their body weight genetic gains and realized heritabilities were estimated. ResultAverage body weight of F2 generation selected strains and control families were 1008.5 and 911.9 g, average daily gains were 3.1 and 2.8 g, instantaneous growth rates were 1.18%and 1.15%/day, respectively. Growth speed of selected strain was 10.6%higher than that of control family, and the difference was significant(P<0.05, the same below). Full length, body length and body height of selected strain increased significantly compared with those of control family. Realized heritabilities of body weight , full length, body length, body height and body width in F2 generation pedigrees were 0.25,0.33,0.22,0.27 and 0.15, re-spectively, belonging to medium heritability. By analyzing seven F2 generation pedigrees selected out of seventy-one F2 generation pedigrees whose survival rates were above 60.0% and average body weight exceeded 1100.0 g, A54 and A35 were identified as two superior F2 generation pedigrees with sound growth traits among all pedigrees. ConclusionBreeding effect of C. carpio F2 generation pedigree is obvious. A54 and A35 are two superior pedigrees with fast growth speed, long body length and synchronous growth. The two pedigrees boast great potential for breeding, and can be used as backup par-ents of next generation of breeding, and provide improved C. carpio fries for breeding field.