The aim of this study was to compare egg quality, carcass, meat characteristics, and bone properties of Taihang chickens in 2 different housing systems at various ages. A total of 168 birds were selected and randomly allocated to 2 groups at 23 wks and raised in conventional cage (CC) or flattening on floor (FF) housing system, respectively. FF hens' egg weight, albumen height, and Haugh unit were higher (P < 0.05), and yolk weight was lower (P < 0.001) than those of the CC hens. Egg quantity of FF hens was higher than that of the CC hens (P < 0.01). The FF hens' weight (P < 0.05) and breast meat percent (P < 0.01) were higher than those of the CC hens. The highest live body and carcass weight were observed at 57 wk (both P < 0.01), whereas the highest semieviscerated percentage (P < 0.01) and meat weight of breast and thigh (P < 0.05) were shown at 49 wk. The highest eviscerated percentage and thigh meat were displayed at 41 and 32 wk, respectively (P < 0.01). For meat color, the lightness of both breast and thigh meat in the FF group was significantly reduced compared with those of the CC group (P < 0.01 and P < 0.05). FF hens' humerus weight and breaking strength (both P < 0.01) and tibia breaking strength (P < 0.05) were significantly higher than those of the CC hens. Femur breaking strength was significantly affected by hens' age (P < 0.01). Egg weight, albumen height, Haugh unit, yolk color (all P < 0.01), pH of thigh meat, semieviscerated, and eviscerated weight (all P < 0.05) were influenced by the interaction of housing system and age, whereas no change in moisture loss rate, meat color, shearing force, and bone quality was found (P > 0.05). In summary, in the 2 housing systems, hens' age and their interaction could affect slaughter performance, quality of egg, meat, and bone of Taihang chickens. In addition, the results of the present study support a theoretical basis for the development and utilization of Taihang chickens in accordance with the FF system.

中文翻译：

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住房制度和年龄对太行鸡产品和骨骼特性的影响。

这项研究的目的是比较两个年龄段的两种不同饲养系统中太行鸡的蛋品质，car体，肉特性和骨骼特性。总共选择了168只家禽，并在23周时随机分为两组，分别在常规笼（CC）或展平在地板（FF）的饲养系统中饲养。与CC母鸡相比，FF母鸡的蛋重，蛋白高度和Haugh单位更高（P <0.05），蛋黄重量更低（P <0.001）。FF母鸡的蛋量高于CC母鸡的蛋量（P <0.01）。FF母鸡的体重（P <0.05）和胸肉百分比（P <0.01）高于CC母鸡。在57 wk时观察到最高的活体和car体重量（均P <0.01），而最高的半内脏剔除率（P <0）。01）以及49 wk时乳房和大腿的肉重（P <0.05）。最高去内脏百分比和大腿肉分别显示在41和32周（P <0.01）。对于肉色，与CC组相比，FF组的胸肉和大腿肉的亮度均显着降低（P <0.01和P <0.05）。FF母鸡的肱骨重量和断裂强度（均P <0.01）和胫骨断裂强度（P <0.05）均显着高于CC母鸡。母鸡的年龄对股骨断裂强度有显着影响（P <0.01）。蛋的重量，蛋白高度，Haugh单位，蛋黄颜色（所有P <0.01），大腿肉的pH，半内脏和去内脏的重量（所有P <0.05）都受到蛋壳系统和年龄的相互作用的影响，而水分没有变化损失率 发现肉的颜色，剪切力和骨质量（P> 0.05）。综上所述，在这两种鸡舍中，母鸡的年龄及其相互作用会影响屠宰性能，太行鸡的蛋，肉和骨头的质量。此外，本研究结果为基于FF系统的太行鸡的开发和利用提供了理论基础。