Unbanded crocodilian eggs do not form an opaque band around their lesser circumference, indicating fertilization failure or early embryonic death. Assuming they represent fertile eggs prior to the onset of embryonic metabolism, the concentration and content of calcium (Ca) and phosphorus (P) in each component (shell, shell membrane, yolk and albumen) of unbanded farm‐laid Nile crocodile (Crocodylus niloticus) eggs were described. The grouping effect of clutch (clutch effect) on each component's Ca and P concentration and content were assessed. Using regression models, the clutch size, clutch laying date, pond of origin, component mass and component Ca and P concentration were evaluated for an effect on each component's Ca and P content. Eggshell made by far the greatest contribution to total egg Ca whilst contributing no measurable P. Yolk contributed by far the greatest quantity of P and a significant quantity of Ca. Albumen contributed variable, but generally very low quantities of Ca and P to the egg. A strong clutch effect existed for shell Ca content and yolk Ca and P concentration and content. A very weak clutch effect existed for shell Ca concentration, and albumen Ca and P concentration. Shell membrane was an unreliable sample type in this study, likely reflecting issues with processing. Shell Ca and yolk Ca and P content were influenced primarily by component mass, and secondarily by element concentration. Albumen Ca and P content was principally influenced by element concentration. These descriptive findings will guide sample selection for future research.

中文翻译：

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尼罗河鳄鱼（Crocodylus niloticus）的未结合卵中的钙和磷

未成束的鳄鱼卵在其较小的周长周围不会形成不透明的条带，表明受精失败或早期胚胎死亡。假设它们代表了胚胎新陈代谢开始前的可育卵，未结合的农场养殖尼罗鳄（Crocodylus niloticus）各成分（壳，壳膜，蛋黄和蛋白）中钙（Ca）和磷（P）的浓度和含量）描述了鸡蛋。评估了离合器对每种成分的Ca和P浓度和含量的分组效应（离合器效应）。使用回归模型，评估了离合器尺寸，离合器铺设日期，原产地，成分质量以及成分Ca和P的浓度对每种成分的Ca和P含量的影响。迄今为止，蛋壳对总蛋Ca的贡献最大，而对可测P的贡献不大。卵黄对P的贡献最大，Ca的含量也很大。蛋白对鸡蛋的贡献很大，但通常钙和磷的含量非常低。壳中Ca含量，蛋黄中Ca和P的含量和含量均存在较强的离合效应。壳中Ca浓度，蛋白Ca和P浓度存在非常弱的离合效应。在此研究中，壳膜是不可靠的样品类型，可能反映了加工问题。壳钙，蛋黄钙和磷的含量主要受组分质量的影响，其次受元素浓度的影响。蛋白和钙的含量主要受元素浓度的影响。这些描述性发现将指导样本选择，以供将来研究之用。