壳寡糖对肉仔鸡生产性能、小肠组织结构和肌组织矿物质元素含量的影响

采用单因子试验设计,选1日龄28000只AA肉仔鸡,随机分为4组,以研究饲料中添加不同剂量(0g/t、5g/t、25g/t、125g/t)的壳寡糖对生产性能、消化器官生长发育、小肠组织结构以及胸、腿肌组织中矿物元素含量的影响。研究结果表明:随壳寡糖添加剂量增加各周龄平均体重增加, 7周龄出栏时壳寡糖组(125g/t)平均体重增加140g,提高5. 85%,料重比降低3. 93%;与对照组比较壳寡糖组(125g/t)肉仔鸡的肝脏、胆囊、胰腺、嗉囊、肌胃和腺胃的相对重量均降低,胰腺和腺胃分别降低7. 19%和10. 34%,差异显著(p<0. 05);十二指肠、空肠、回肠、盲肠和结直肠相对重量均减小,十二指肠减少14. 05%、盲肠和结直肠分别减少12. 75%和19. 59%,有显著差异(p<0. 05);空肠和回肠的绒毛高度(p<0. 05)和十二指肠、空肠、回肠的隐窝深均增加(p<0. 05),而绒毛宽度减小(p<0. 05),肠壁和粘膜厚度下降(p<0. 05);壳寡糖组(125g/t)肉仔鸡胸肌中除P元素减少外, Ca、Zn、Fe和Mn元素含量均比对照组高(p<0. 05);腿肌中Ca、P、Zn、Fe和Mn元素含量均比对照组高,除Mn外各元素差异显著(p<0. 05)。说明壳寡糖对肉仔鸡具有降低肠壁厚度、改善肠粘膜结构、提高消化器官功能,从而利于营养物质的吸收,促进生长的作用。同时,还能增加胸、腿肌中Ca、P、Zn、Fe和Mn各

Effect of Oligo-chitosan on Broiler Performance, Small Intestine Structure and Muscle Mineral Element Concentration

Twenty-eight thousand broilers in 1d age were randomly divided into four groups: control group and oligo-chitosan groups at dose of 5g/t, 25g/t, and 125g/t, respectively. The effect of oligo-chitosan on broiler performance, growth and development of digestive organ, small intestine structure, mineral element contents in muscle were studied. The results show that the average body weight in every oligo-chitosan group increases with oligo-chitosan dosage increase. In the group of 125g/t oligo-chitosan, the average body weight increases by 5.85% after seven weeks, 140g higher than that of the control; the food/gain ratio decreased 3.93%; the relative weights of liver, gallbladder, pancreas, crop, gizzard and glandular stomach decrease, pancreas by 7.19% and glandular atomach by 10.34% respectively (p<0.05); the relative weights of intestine decrease, by 14.05% for duodenum, 12.75% for caecum, 19.59% for colorect (p<0.05); the villous height of jejunum and ileum increases (p<0.05); the cypt depth increases (p<0.05) and the villous width decreases (p<0.05) for duodenum, jejunum and ileum; the thickness of macosa and intestinal wall of duodenum, jejunum and ileum decease (p<0.05). In the group of 125g/t oligo-chitosan , the contents of Ca, Zn, Fe, and Mn in brisket and Ca, P, Zn, Fe in leg muscle are higher significantly (p<0.05) than the control. It can be concluded that oligo-chitosan can reduce the thickness of intestinal wall, improve the structure of intestinal macosa, enhance the functions of digestive organ, and so increase the absorb-ability to nutrients. Oligo-chitosan can also increase contents of mineral elements (Ca, Zn, Fe and Mn) in brisket and leg muscle.