Line effect and phenotypic correlations among egg qualitative traits in Japanese quail eggs selected on yolk cholesterol content
2007
Baumgartner, J., Slovak Agricultural Research Centre, Nitra (Slovak Republic) | Končeková, Z., Slovak Agricultural Research Centre, Nitra (Slovak Republic) | Benková, J., Slovak Agricultural Research Centre, Nitra (Slovak Republic)
Birds of S18 generation of line 11 selected for low- and line 12 for high yolk cholesterol content and line 13 as unselected control were used for this experiment. 14-week old quail hens of each of the three-yolk cholesterol lines were used for the analysis. Egg quality characters were obtained from three consecutively laid eggs of each hen, 60 hens were tested from each line. We measured egg weight, yolk weight, shell weight, albumen weight and edible part of egg (g), yolk egg proportion (%) and egg shape index (length x 100/with in %). Yolk cholesterol content (mg per 100 g of fresh yolk) was estimated according to enzymatic hydrolysis and oxidation method (Cholesterol liquicolor test of Human Gesellschaft für Biochemica und Diagnostica GmbH, Germany). We also calculated cholesterol content in edible part of egg (mg per 100 g). Presented results showed the effectiveness of genetic selection towards yolk cholesterol content of both direction but the selection was more effective in low cholesterol line as in the high cholesterol line. The differences between both lines were high and very highly significant. Also the differences of the yolk cholesterol content between selected lines and unselected control were considerable. The correlations between yolk cholesterol content and other investigated egg quality traits were mainly negative and weak or moderately strong but there were evident differences between investigated lines especially between line 11 selected for low- and line 12 selected for high yolk cholesterol content.
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