高山姬鼠幼仔的生长发育和产热特征

Growth and thermogenesis in pups of Apodemus chevrieri

根据高山姬鼠幼仔56d的生长资料初步分析了其生长发育规律;用电子天平测量了体重的增长过程;用开放式呼吸仪测定了静止代谢率(Resting metabolic rate,RMR)、非颤抖性产热(Nonshivering thermogenesis,NST)以及肺皮蒸发失水(Evaporative waterloss,EWL)。依据逻辑斯蒂曲线的拐点,高山姬鼠的体重生长可划分为加速生长相和减速生长相。幼仔的体温在17日龄前逐渐升高,35日龄时接近成体水平;静止代谢率和非颤抖性产热在17日龄前随日龄逐渐增大,17日龄后与体重成异速增长关系,RMR在49日龄时接近成体水平,NST在6日龄内即被激活;蒸发失水在断乳前较断乳后为高。高山姬鼠为典型的晚成性发育动物。高山姬鼠较短的妊娠期、较大的胎仔数、较长的哺乳期与其食物资源较丰富有关。

Using 56 days of postnatal data from Apodemus chevrieri, this paper analyzed tentatively its growth rules. Electronic scales and Open-Circuit Respirometry were used to measure body mass,resting metabolic rate, non-shivering thermogenesis, and evaporative water loss. A. chevrieri weight growth could be divided into rapid-growing and slow-growing situations based on the inflection point of a logisitic growth curve. Body temperature of pups increased with age, and approached the adult level at 35 days of age. Resting metabolic rate （RMR） and Nonshivering thermogenesis （NST） increrased with age at early time points and then showed allometry with body mass. RMR reached the adult level!at 49 days of age. Onset of NST occurred during the 6th day after birth and its evaporative water loss （EWL） was higher during lactation than during the weaning period. A. chevrieri is an altricial mammal. The short gestation time, larger litter size, and longer lactation term of A.chevrieriare consistent with the relatively abundant food supply in its habitat.