Comparison of growth and survival among selected population, inbreeding population, and wild population in Fenneropenaeus chinensis
Tóm tắt
In this study, inbreeding population was constructed by full-sib mating of “Huang Hai No. 2” core population in Fenneropenaeus chinensis. Growth and survival of three different stages were studied in three populations, including selected population, inbreeding population, and wild population. The growth experimental results show that body weight of selected population in all the three growth stages was significantly higher than those of inbreeding population and wild population (P < 0.05). At day 90, body weight of the selected population increased by 13.1 and 19.4%, compared with those of inbreeding population and wild population and the specific growth rate (SGR) for body weight of three populations were 2.24, 2.16, and 2.11. Coefficient of variation of body weight among the three populations were different; the highest was 23.75% in the selected population and the lowest was 16.76% in the wild population, which showed that there is potentiality for further selection. The survival results indicated that the difference of survival of the three populations were significant (P < 0.05), that of the selected population increased by 10.78 and 14.20%, compared with those of inbreeding population and wild population, and the average survival rate of the three populations were 74, 66.8, and 64.8%, respectively. Full-sib matings revealed that the amount of inbreeding depression of body weight varied from −7.68 to −11.53%, and the estimated average inbreeding depression coefficient was −4.61 per 10% increase of inbreeding coefficient of F. For survival trait, the estimated average inbreeding depression coefficient ranged from −2.62–3.81%, and the inbreeding depression was −1.05 per 10% increase of inbreeding coefficient of F, lower than the estimate obtained for growth. These results suggest that selection works well in the breeding program of F. chinensis, and inbreeding especially full-sib matings should be avoided in the following breeding programs.
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