Dunn I C, Bain M, Edmond A, Wilson P W, Joseph N, Solomon S, De Ketelaere B, De Baerdemaeker J, Schmutz M, Preisinger R, Waddington D
Roslin Institute (Edinburgh), Roslin, Midlothian, Scotland.
Br Poult Sci. 2005 Jun;46(3):280-6. doi: 10.1080/00071660500098574.
Cracked eggshells result in economic loss and provide a route for pathogenic organisms to enter the egg. Genetic factors that contribute to shell strength are likely to decrease the risk that an egg will crack when subject to insult. A novel measurement, the dynamic stiffness of the eggshell (Kdyn) was examined to determine if it might be used in the genetic selection of hens with improved eggshell characteristics. The measurement is determined from acoustic resonance frequency analysis. The estimates of heritability for the novel measurement of Kdyn were moderately high and ranged from 0.33 to 0.53 depending on the model used for the estimation. The estimates of genetic correlation of Kdyn with eggshell breaking strength (0.49) and static stiffness (0.57) were positive and relatively large as expected. There was a small negative genetic correlation between Kdyn and egg production from 26 to 50 weeks of age (-0.19) and a moderate one from 58 to 74 weeks of age (-0.36). The moderate heritability and relative independence of Kdyn indicates that this measurement could be used successfully in a breeding programme to improve shell quality and to reduce the incidence of cracks.
蛋壳破裂会导致经济损失，并为致病微生物进入鸡蛋提供途径。影响蛋壳强度的遗传因素可能会降低鸡蛋在受到损伤时破裂的风险。研究了一种新的测量方法——蛋壳动态刚度（Kdyn），以确定它是否可用于遗传选择具有更好蛋壳特性的母鸡。该测量通过声共振频率分析确定。Kdyn这种新测量方法的遗传力估计值中等偏高，根据用于估计的模型不同，范围在0.33至0.53之间。正如预期的那样，Kdyn与蛋壳破裂强度（0.49）和静态刚度（0.57）的遗传相关性估计值为正且相对较大。在26至50周龄时，Kdyn与产蛋量之间存在较小的负遗传相关性（-0.19），在58至74周龄时存在中等程度的负遗传相关性（-0.36）。Kdyn的中等遗传力和相对独立性表明，这种测量方法可以成功地用于育种计划，以提高蛋壳质量并降低破裂发生率。
