In this study, the objective was to evaluate the effect of the age of Hy-line Brown hens – 44 and 60 weeks of age (26 and 42 weeks of laying) and housing system (enriched cages and litter) on the quality of eggs. According to our results, eggs with a better quality of albumen were obtained from younger hens than from older hens. Moreover, older hens produced eggs with inferior quality related to shell parameters, such as greater elastic deformation, poorer breaking strength, and thinner shells. However, hens kept in a litter housing system laid eggs with superior shell quality characteristics of less flexible and greater breaking strength, even though the thickness, weight, and percentage were similar in both housing systems. In addition, a higher amount and activity of lysozyme were obtained from eggs laid by hens kept in the litter housing system than those obtained from hens kept in cages. The maintenance system and age of birds also had a significant (P≤0.05) effect on the basic chemical composition of eggs, as well as on the proportion of individual elements and fatty acid profile. Taking these results into account, we can conclude that the more valuable characteristics from the morphological and nutritional point of view were observed in eggs obtained from younger Hy-line hens kept in the litter housing system.

中文翻译：

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蛋鸡的年龄和饲养系统对鸡蛋理化特性的影响

在这项研究中，目的是评估Hy-line布朗母鸡的年龄-44和60周龄（产蛋26和42周）和住房系统（笼养和垫料）对蛋品质的影响。根据我们的结果，从年轻的母鸡那里获得的蛋清质量要好于从更大的母鸡那里获得的蛋白。而且，年长的母鸡生产的蛋质量与蛋壳参数有关，如弹性变形较大，断裂强度较差和蛋壳较薄。但是，饲养在垫料箱系统中的母鸡所产的鸡蛋具有出众的蛋壳质量特征，即柔韧性和断裂强度更高，即使两种系统的厚度，重量和百分数相似。此外，从笼养系统中饲养的母鸡产下的卵比从笼中饲养的母鸡获得的溶菌酶的量和活性更高。鸟类的维持系统和年龄也对鸡蛋的基本化学成分以及各个元素的比例和脂肪酸谱有显着（P≤0.05）的影响。考虑到这些结果，我们可以得出结论，从形态和营养角度来看，在垫料房系统中从较年轻的Hy-line母鸡获得的鸡蛋中观察到了更有价值的特征。