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Effects of calcium diet supplements on egg strength in conventional and furnished cages, and effects of 2 different nest floor materials

机译：钙饮食补充剂对常规和带网箱的鸡蛋强度的影响，以及两种不同巢层材料的影响

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Several studies have demonstrated a greater incidence of cracked eggs in furnished than in conventional cages. Hens kept in furnished cages may have greater bone strength, so they may lay eggs with weaker shells because they may utilize more calcium for bone mineralization and less for shell formation. The effects of increased dietary calcium content were therefore studied in 3-hen conventional and 8-hen furnished cages. In addition, the effects of 2 different nest floor materials were studied in furnished cages. A total of 1,216 Lohmann Selected Leghorn hens were housed in either furnished or conventional cages and offered either the normal calcium supplementation used in commercial diets (37 to 40 g of calcium/kg) or increased calcium supplementation (44 to 50 g of calcium/kg) consisting of added limestone for 3 consecutive feeding phases of 20, 16, and 16 wk. Dietary calcium had similar effects in both cage systems. Greater limestone supplementation increased the laying rate (P < 0.05). Increased dietary limestone had no significant effects on egg quality, and no effects on tibia-breaking strength or specific gravity were observed. The laying rate was higher in conventional than in furnished cages (P < 0.05), but there was no significant difference between the cage types in terms of total egg mass produced. The cage type had no effect on tibia-breaking strength. However, the specific gravity and ash content of tibias were higher in hens kept in furnished than in conventional cages (P < 0.001). Based on this study, the weakening of eggshells in furnished cages is not caused by a possible calcium shortage resulting from high bone mineralization.
机译：多项研究表明，带家具的鸡蛋破损的发生率比传统笼子更高。饲养在有家具的笼子中的母鸡可能具有更高的骨骼强度，因此它们可能会在蛋壳较弱的情况下产蛋，因为它们可能会利用更多的钙来使骨骼矿化，而减少蛋壳的形成。因此，在3头常规鸡笼和8头有棚鸡笼中研究了饮食中钙含量增加的影响。另外，在带家具的笼子中研究了两种不同的巢地板材料的效果。总共1,216头Lohmann精选来格霍恩母鸡饲养在有家具的笼子或常规笼子中，并提供商业饮食中所用的正常钙补充（37至40克钙/千克）或增加钙补充（44至50克钙/千克） ）由添加的石灰石组成，分别用于20、16和16周的三个连续进料阶段。膳食钙在两个笼式系统中具有相似的作用。补充更多的石灰石可增加产蛋率（P <0.05）。饮食中增加的石灰石对蛋品质没有显着影响，也没有观察到对胫骨断裂强度或比重的影响。常规的产蛋率高于带家具的笼子（P <0.05），但是笼子类型之间的总产蛋量没有显着差异。笼型对胫骨的断裂强度没有影响。但是，饲养在带家具的母鸡中胫骨的比重和灰分含量高于传统笼子中的母鸡（P <0.001）。根据这项研究，带家具的笼子里的蛋壳变弱并不是由于高骨骼矿化引起的钙缺乏引起的。

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