单宁酸对根田鼠断乳幼体生长和存活的影响

在食物中含10％和20％蛋白质条件下，测定了单宁酸对根田鼠幼体在断乳后20d内的生长和存活的影响。结果表明，食物中含蛋白质为10％的条件下，摄食含3％和6％单宁酸食物的试验个体生长速率分别为-0．135g/d和-0．25g/d，食物利用效率均显低于对照组，断乳后20d内平均存活天数较对照组分别下降26．23％和49．36％。在食物蛋白质为20％的条件下，摄食含3％和6％单宁酸食物的试验个体生长速率分别为0．134g/d和-0．116g／d，摄食6％单宁酸食物的试验个体食物利用效率显低于摄食3％单宁酸食物的试验个体和对照组个体，断乳后20d内的平均存活天数较对照组下降39．41％，摄食3％单宁酸食物的试验个体较对照组略有下降，但不显。上述结果验证了单宁酸能显影响植食性小哺乳动物生长和存活的假设。

Effect of Tannic Acid on the Growth and Survival of Root Voles(Microtus oeconomus)

The objective of this study was to investigate the effects of tannic acid on the growth and survival of small mammalian herbivores. Measurements were conducted with weaned root voles fed with 3% or 6% tannic acid and 10% or 20% protein in their diets. The results indicated that the effect of tannic acid on growth rate of weaned root voles was greater when given a lower protein diet than a higher protein diet. After 20 d, with 10% protein diets, mean growth rates of the weaned voles fed with 3% or 6% tannic acid were -0.135 g/d and -0.25 g/d, respectively. When given 20% protein diet, mean growth rates of weaned root voles fed with 3% and 6% tannic acid for 20 d were 0.134 g/d and -0.116 g/d, respectively. Food utilization efficiencies of the voles fed with 3% and 6% tannic acid diets were significantly lower than that of the control diet at the level of 10% protein. When given the 20% protein diet, food utilization efficiencies of weaned voles fed with 6% tannic acid were significantly lower than that of the voles fed with 3% tannic acid diet or the control diet with the 10% protein diets, the average survival days of the weaned voles fed with 3% and 6% tannic acid diets decreased 26.23% and 49.36% compared to controls at the end of trial period, respectively. With 20% protein diets, the average survival of weaned voles given 6% tannic acid diet decreased 39.41% compared to controls at the end of trial period, although weaned voles given 3% tannic acid had a slight decrease of average survival days. The results of this study suggested that tannins could substantially affect the individual performance of weaned root voles.