Control of the ruminal pH depression produced during the concentrate feeding - The possibility of the increase in a saliva secretion by the mechanical stimulus to the ruminal wall

控制精料饲喂过程中产生的瘤胃 pH 值下降 - 通过对瘤胃壁的机械刺激增加唾液分泌的可能性

• 批准号: 11660273
• 负责人: YAMAZAKI Atusi
• 金额: $ 2.24万
• 依托单位: Kitasato University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11660273/
• 关键词: Ruminants; Ruminoreticulum motility; Mechano-receptor; Mechanical stimulation; Rumination; 機械的刺激; 物理的刺激; 第一・ニ胃運動

The influence which the mechanical stimulus added into the ruminoreticulum of a ruminant has on the saliva secretion, the ruminoreticulum motility, and the nature of digestion in a rumen during concentrate fed was investigated.The +Stim conditions which added the mechanical stimulus to the rumen were compared with the control conditions (-Stim).There was no significant difference in the number of ruminoreticulum contraction per day. However the rate of the rumination to a primary cycle increased significantly on +Stim conditions. Especially, the number of ruminations increased from the midnight to early morning. The amount of saliva secretions per day showed the tendency which increases on +Stim conditions. The increase at the time of a feeding was larger than -Stim conditions on +Stim conditions. The range of fluctuation within a day of a ruminal pH was small on +Stim conditions.Especially, pH depression rate after feeding start was significantly smaller than -Stim conditions. The total VFA concentration in a rumen became high significantly on +Stim conditions, the rate of the dry-matter digestion in a rumen in +Stim conditions had the low rate of hay digestion, and its rate of concentrate digestion was high. The mechanical stimulus to the rumen given to the ruminant fed in the concentrate stimulated the mechano-receptor in a ruminoreticulum. The rate of a rumination was made to increase although a mechanical stimulus does not change the number of ruminoreticulum movements. Consequently, it was suggested that the increase in the amount of saliva secretions and the stability of pH in the stomach may be caused, and the improvement in the fermentability in a forestomach and the improvement in the rate of digestion may finally be caused.

本文研究了在反刍动物瘤胃中加入机械刺激物对反刍动物唾液分泌、瘤胃运动和瘤胃内消化性质的影响，并将加入机械刺激物的+Stim条件与对照条件（-Stim）进行了比较。然而，反刍的主要周期的速度显着增加+刺激条件。特别是从午夜到清晨，反刍的次数增加。每天唾液分泌量在+Stim条件下呈增加趋势。喂食时的增加大于+Stim条件下的-Stim条件。+Stim组瘤胃pH值在一天内的波动幅度较小，尤其是开始饲喂后pH值的下降幅度显著小于-Stim组。在+Stim条件下，瘤胃内总VFA浓度显著升高，干物质消化率低，精料消化率高。对饲喂浓缩物的反刍动物给予的瘤胃机械刺激刺激了反刍动物网囊中的机械感受器。反刍的速率增加，虽然机械刺激不改变ruminoreticulum运动的数量。因此，提示可能导致唾液分泌量的增加和胃中pH的稳定性，并且可能最终导致前胃中发酵性的改善和消化速率的改善。