Lennards R, Roland D A, McGuire J A
Poult Sci. 1981 Nov;60(11):2501-5. doi: 10.3382/ps.0602501.
Experiments were conducted to determine the relationship of serum calcium to shell weight and other criteria. Blood samples for calcium analysis were taken at oviposition in Experiments 1 and 2 from hens fed a 3.5% calcium diet. In Experiment 3, blood was taken at various intervals from hens laying a high or low incidence of shell-less eggs. These hens were fed a control diet or various calcium-deficient diets throughout a 45-day period. No relationship was found between serum calcium and shell weight, or egg weight. Hens laying a high incidence of shell-less eggs showed no decrease in serum calcium or egg production when fed a .58, .25, or .07% calcium diet. However, these criteria were reduced in hens laying a low incidence of shell-less eggs. It was concluded that the normal variation in serum calcium is not related to the hen's ability to produce eggshell. The mechanism of action responsible for cessation of lay when control hens were fed a calcium-deficient diet appeared not to function as it does in hens laying a high incidence of shell-less eggs.
进行了实验以确定血清钙与蛋壳重量及其他标准之间的关系。在实验1和实验2中，从饲喂3.5%钙日粮的母鸡中，于产卵时采集用于钙分析的血样。在实验3中，从产无壳蛋发生率高或低的母鸡中，在不同时间间隔采集血样。这些母鸡在45天的时间里一直饲喂对照日粮或各种缺钙日粮。未发现血清钙与蛋壳重量或蛋重之间存在关系。产无壳蛋发生率高的母鸡，在饲喂0.58%、0.25%或0.07%钙日粮时，血清钙或产蛋量未出现下降。然而，产无壳蛋发生率低的母鸡，这些指标有所降低。得出的结论是，血清钙的正常变化与母鸡产蛋壳的能力无关。当给对照母鸡饲喂缺钙日粮时导致产蛋停止的作用机制，在产无壳蛋发生率高的母鸡中似乎不起作用。
