饲养系统（户外养殖与笼养）及蛋鸡年龄对鸡蛋品质的影响。

Effects of housing system (outdoor vs cages) and age of laying hens on egg characteristics.

Van Den Brand H, Parmentier H K, Kemp B

Adaptation Physiology Group, Wageningen Institute of Animal Sciences, Wageningen University, Wageningen, The Netherlands.

Br Poult Sci. 2004 Dec;45(6):745-52. doi: 10.1080/00071660400014283.

Abstract

Effects of two housing systems (cages vs outdoor) on external and internal egg characteristics were investigated. 2. In total 785 eggs from three different lines in cages and 268 eggs from outdoor-housed layers were examined for egg weight, albumen, yolk and shell content, albumen height and pH, and albumen and yolk dry matter content. 3. Interactions between layer age and housing systems were found for egg weight, eggshell content, albumen height, albumen pH, and dry matter content of the albumen and yolk. This was mainly due to the greater variation with age in the outdoor layers, compared to the caged layers. 4. Irrespective of age eggs from outdoor layers were relatively broader than eggs from the caged layers. Yolk colour was considerably darker in the outdoor group (11.0 vs 9.3). 5. We concluded that it is more difficult to maintain constant external and internal egg quality in an outdoor housing system than in a battery cage system. Factors that determine the greater fluctuations in internal egg quality need to be investigated.

摘要

研究了两种饲养系统（笼养与户外饲养）对鸡蛋外部和内部特征的影响。2. 总共检查了笼养的三个不同品系的785枚鸡蛋以及户外饲养母鸡所产的268枚鸡蛋，检测了蛋重、蛋白、蛋黄和蛋壳含量、蛋白高度和pH值，以及蛋白和蛋黄干物质含量。3. 发现蛋重、蛋壳含量、蛋白高度、蛋白pH值以及蛋白和蛋黄干物质含量在蛋鸡年龄和饲养系统之间存在相互作用。这主要是因为与笼养蛋鸡相比，户外蛋鸡随年龄增长的变化更大。4. 无论年龄如何，户外饲养母鸡所产鸡蛋相对比笼养蛋鸡所产鸡蛋更宽。户外组的蛋黄颜色明显更深（分别为11.0和9.3）。5. 我们得出结论，与层架式笼养系统相比，在户外饲养系统中更难保持鸡蛋恒定的外部和内部品质。需要研究决定鸡蛋内部品质波动更大的因素。