2龄前扬子鳄肠道的年龄结构变化

INTESTINAL STRUCTURE OF ALLIGATOR SINENSIS BEFORE TWO YEARS OLD

光镜下 ,用组织学和组织化学的方法对四个不同年龄段扬子鳄不同肠段进行了研究。扬子鳄肠道长度随年龄增大而增加 ,相对长度从初生至 8月龄逐减 ,从 8月龄至 2龄增大。肠道各项组织学参数绝对值均随年龄增长而增加 ,相对值从初生至 5月龄变化很大 ,5月龄至 2龄变化不明显。肠粘膜的高碘酸雪夫氏 (PAS)反应强度亦随年龄增长而增强 ,其中 ,初生鳄与 5月龄鳄差异很大 ,5月龄后基本稳定。可见 ,初生鳄肠道尚未发育完全。本文还对鳄的人工饲养提出了建议。

The intestines of Alligator sinensis of four different ages were studied by histological and histochemical methods under light microscope.The intestine length increased with the increase of age,the relative length of intestines decreased from the newborn chinese alligators to those of 8\|month of age,increased from those of 8\|month of age to those of 2\|year of age.The absolute value of the histological parameters of intestines increased with the increase of age.Their relative value changed significantly from the newborn alligators to those of 5\|month of age,but not significantly from those of 5\|month of age to those of 2\|year of age.The level of PAS\|reaction also increased with the increase of age.The PAS\|reaction level was different between the newborn alligators and 5\|month\|old alligators,and changed little from the alligators of 5\|month of age to those of 2\|year of age.It can be concluded that the intestines of newborn alligators were undeveloped.According to the results,we gave some advice to artificial culture of chinese alligators.