A Quantification of Jaw Movements during Grazing and Rumination in Free-ranging Cattle by an Ambulatory Data-logger

概要

論文の詳細を見る
An ambulatory data-logger for the simultaneous recording of the number of jaw movements, the number of pauses between jaw movements longer than 3 seconds in one minute and the J-J intervals (the interval between two successive jaw movements) was previously developed and tested using grazing cattle. The apparatus consists of a transducer (a silicone tube filled with carbon granules) fixed to the side of the lower jaw, a pre-amplifier and three heart rate memory units. In this paper, a quantification of the rhythms of jaw movements during grazing and rumination period is tried and tested among grazing cattle. The J-J intervals for biting and chewing during grazing is represented by J-Jg and those for remasticating during rumination and pauses of jaw movements between bouts of remasticating by J-Jr and J-Jp, respectively. These parameters, the number of jaw movements per bolus, the remasticating time per bolus and the interval between two successive regurgitations are calculated using the data of the J-J intervals. J-Jg represents biting and chewing rhythms which are not well explained by just the number of jaw movements per minute, and also J-Jr and J-Jp represents remasticating rhythms and swallowing and regurgitating rhythms, respectively.
公益社団法人日本畜産学会の論文