【摘要】 利用图像分析法研究1月龄,4月龄和6月龄健康利杂犊牛小肠结构的发育形态变化。结果显示,犊牛小肠各段在不同的月龄,其长度变化差异显著(P<0.05);不同月龄犊牛的十二指肠、空肠、回肠的黏膜厚度、肌层厚度不同程度的增加且差异极显著(P<0.01);从1月龄至6月龄,十二指肠、回肠绒毛长度分别增加45.7%和8.0%;而空肠的绒毛以4月龄最长(392.48μm),绒毛高度/隐窝深度(V/C)值以4月龄的最大(2.63),且与1月龄和6月龄时比较差异极显著(P<0.01),但1月龄与6月龄相比较差异不显著(P>0.05)。结果提示,6月龄前犊牛小肠黏膜结构变化较大,犊牛断奶合理日龄应进一步研究。更多还原

【Abstract】 The study investigated the morphological changes of small intestinal mucosa and the lengths of different intestinal segments in Limisin-crossbred calves,by using the Scion image software,at the age of 1 month,4 month and 6 month,respectively.The length of small intestine showed a steady increase with age peaking at 6 month.The thickness of mucosa,submucosa and submucous muscle layer of the duodenum,jejunum and ileum were noticeably increased at 6 month compared with those of 1 and 4 month.At 6 month,the length of vill in the duodenum and ileum increased 45.7% and 8.0%,compared with those of 1 month,the length of vill in the jejunum was longest,392.48μm,at the age of 4 month old.Between 1 and 6 month,the value of V/C was highest at the age of 4 month reaching 2.63.The difference of V/C value between 1 and 4 months was significant(P<0.01).No difference,however,were found between 1 and 6 months(P>0.05).We concluded from this study that the morphological structure of small intestine changed markedly in calves with age,however,the exact mechanism on how calf weaning period is not clarified to date,warranting further research.更多还原