产仔大熊猫孕激素变化规律研究

The progesterone change in parturition giant pandas

在过去的30年中,非干扰性的内分泌检测技术逐渐运用到大熊猫的研究中来.已经有许多研究人员报到了大熊猫独特的繁殖特点.但不足的是这些研究都是基于很小数量的大熊猫.本研究追踪了大熊猫30次妊娠的情况.研究发现大熊猫的整个妊娠期可以分为三个部分.第一期为大熊猫雌激素峰值到孕激素第二次上升开始,平均为93.21±22.52天(MAX=125,MIN=50,N=29);第二期为大熊猫孕激素第二次上升开始到孕激素峰值,平均为24.86±9.76天(MAX=53,MIN=8,N=29);第三期为大熊猫孕激素峰值到大熊猫产仔,平均为19.60±5.13天(MAX=29,MIN=8,N=29).妊娠期的长短与孕激素第一期密切相关,R=0.912.产仔大熊猫与未产仔大熊猫孕激素峰值差异显著,P=0.022.

Non-invasive endocrinology technique has been used on the giant panda over the past 30 years.Many researchers have reported the unique characteristics of giant panda reproduction.Unfortunately,many of these studies are done on individual or exceedingly small group of pandas.In this study,30 pregnancies with births are traced.The results indicate that the whole gestational period can be separated by three phases.Phase one is defined from estrogen peak to progesterone secondary rise.Phase two is defined as the progesterone secondary rise to progesterone peak.Phase three is defined as the duration from progesterone peak to parturition.Phase one is varying because of the delayed implantation.The mean is 93.21±22.52（n=29） days.Phase two and phase three are constant among all panda lasting 24.86 ± 9.76（n=29） and 19.60 ± 5.13（n=29） separately.The whole gestation is high correlated to phase one,R=0.912.The progesterone peak of pandas who give birth and pandas who do not are different,P=0.022.Using progesterone peak can help us to forecast the possible birth and time of parturition.