Graduate Thesis Or Dissertation
 

Evaluation of combining ability in mosquitofish

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/v979v607x

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  • Two replications of a half dial lei cross experiment were performed among four inbred lines of mosquitofish, Gambusia affinis. These inbred lines originated from three random-bred stocks: OR, TX and CD. The experiment was conducted as a completely randomized design. Experimental material consisted of parental lines and F₁ populations maintained under identical environment. Information concerning fecundity, size of female and generation interval was obtained from F₁ populations. Estimates of gene action were determined by calculating heterosis and by analyzing for general and specific combining ability. In addition, phenotypic correlations among all the traits were determined. Significant differences among crosses were observed for generation interval (P<0.01) and for fecundity (P<0.05), while no significant differences were detected for body size in females. For fecundity, measurable positive heterotic effects and significant differences in specific combining ability indicated that the genes with non-additive effects played the main role in the expression of this trait. For size of female, heterotic effects were small and negative, and no significant differences in combining ability were observed. Thus, in the inheritance of this character the main role may be attributed to the additive components of variance. Due to the highly significant general combining ability effects and small heterosis values, the expression of generation interval is greatly influenced by additive genetic effects. Parental evaluation in terms of general and specific combining ability values was considered for all traits studied. Strain ORK was identified as a good combiner for all three traits except when crossed with the related line, ORJ, or when inbred. Crossbreds ORKxTXA and 0RKxCDC excelled over the other hybrids with respect to higher fecundity and shorter generation interval, but were of smaller size at the time of reproduction. Correlation coefficients indicated that the fecundity was highly associated with size of female but was not associated with generation interval. The relationship between body size and generation interval was also important. These findings would indicate that smaller and younger fish in this study had lower fecundities than larger and older fish.
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file details PongthanaNuanmanee1984.pdf 2017-08-16 Público Baixar