太行鸡、海兰灰蛋鸡消化道排空速度的比较研究

Comparison on Digestive Tract Clearance Speed of Taihang and Hy-line Layers

选择91日龄太行鸡和海兰灰蛋鸡,分别在强饲后的4、8、14、18、24、28、32、34 h屠宰,比较两品种体重、消化器官的差异,禁食时间对消化道残留内容物含量的影响及消化道不同部位的排空速度和排空率。结果表明:太行鸡体重、嗉囊、腺胃肌胃相对重均小于海兰灰蛋鸡,小肠、直肠相对长度低于海兰灰蛋鸡,盲肠相对长度高于海兰灰蛋鸡。两品种鸡随禁食时间的延长消化道内容物减少,排空规律基本一致;太行鸡嗉囊、腺胃肌胃、小肠及整个消化道的排空率大于海兰灰蛋鸡;而消化道后段直肠、盲肠的排空率小于海兰灰蛋鸡;太行鸡排空速度比海兰灰蛋鸡快。

Taihang and Hy-Line layers of ninety--one days age were killed at 4,8,14,18,24,28,32,34 h,respectively, after they were gavaged. The differences of body weight （BW）,intestinal weight between the two breeds were measured. Effects of different fasting time on the residual contents of digestive tract,emptying rate and free rate of different parts of digestive tract were studied. The results indicated that BW,crop,proventriculus gizzard relative weight of Taihang layers were less than those of Hy-Line layers,small intestine,rectum relative length of Taihang layers were less than those of Hy-Line layers,the relative length of the cecum was higher than that of Hy-Line layers. With the extension of fasting time,chyme＇s emptying curves of Taihang and Hy-Line layers were the same basically;the emptying rate of craw,glandular stomach and gizzard,small intestine,total intestine of Taihang layer were higher than those of Hy-Line layers,whereas rectum,caecum were lower. The clearance time of feed residues of Taihang was faster than that of Hy-Line layers.