Alleva J J, Alleva F R, Lipien M W
Lab Anim Sci. 1976 Feb;26(1):57-62.
Concretions of calcium carbonate normally appear every third and fourth da of the 4-da hamster cycle da 1 = day of ovulation). We presently found that the 2-da relation between ovulation and concretion formation was maintained even after ovulation was delayed 1 or more da by centrally acting drugs or by exposing the hamsters to constant light. It is therefore possible to identify days of ovulation in vaginal washing records of both normal and treated hamsters by counting back 2 da from each sequence of concretions.
碳酸钙凝结物通常在4天仓鼠周期的第三天和第四天出现（第1天 = 排卵日）。我们目前发现，即使通过中枢作用药物或使仓鼠暴露于持续光照下使排卵延迟1天或更多天，排卵与凝结物形成之间的2天关系仍得以维持。因此，通过从每一系列凝结物倒推2天，就有可能在正常和经处理仓鼠的阴道冲洗记录中确定排卵日。
