关键词: 甘肃鼠兔, 生长, 逻辑斯蒂曲线

Abstract: The growth data of 14 Gansu pikas of 3 litters from birth to age of 56 days were collected in 1998. Fitting a Lxgistic equation to the data yielded the following relationship between body weight (w) and age (t):
W=51.4208/1+exp (1.9289-0.0940 t)
Where w was expressed in grams and t in days.
Based on the above equation, the postnatal growth of Gansu pika was divided into two phases, i. e. accelerating growth before the Logistic curve’s inflexion point at which w is about 25.71 grams and t is about 20.5 days, and decelerating growth after the inflexion point.
According to the dynamics of instantaneous growth rate of body weight (the first derivative of w to t), the growth was divided into three periods. The first was slow-growing period, which was from birth to age of about 6.5 days. The second was fast-growing period starting at age of about 6.5 days and ending at age of about 34.5 days. And the last was asymptotic growing period, which was the part after about 34.5 days.

Key words: Gansu pika (Ochotona cansus), Gowth, Logistic curve