Kononoff P J, Lehman H A, Heinrichs A J
Department of Dairy and Animal Science, The Pennsylvania State University, University Park 16802, USA.
J Dairy Sci. 2002 Jul;85(7):1801-3. doi: 10.3168/jds.S0022-0302(02)74254-9.
Detailed knowledge of chewing and rumination activities is critical to fully understand the dietary factors affecting normal rumen function. An automatic system for the digital recording of the jaw movements in free-ranging grazing cattle has been described, but its ability to measure chewing activity of cattle housed in confinement and fed total mixed rations has not yet been evaluated. The eating and ruminating behaviors of eight lactating dairy cows were recorded simultaneously by a wireless automatic system and by 5-min interval observation over 24-h periods. Results indicated that both methods agreed on identification of eating and ruminating bouts. Mean differences between methods for total time eating (8.7 min +/- 12.8) and ruminating (42.9 min +/- 12.0) were significantly different. The time recorded by observation in both eating and rumination was 3.6 and 10.3% higher compared with the automatic system. Differences indicate inaccuracies in the observational method itself. The automatic system may prove useful in further studies examining eating and rumination activities in cattle.
详细了解咀嚼和反刍活动对于全面理解影响瘤胃正常功能的饮食因素至关重要。已有文献描述了一种用于数字记录自由放牧牛下颌运动的自动系统，但尚未评估其测量圈养并饲喂全混合日粮的牛咀嚼活动的能力。通过无线自动系统和在24小时内每隔5分钟进行一次观察，同时记录了八头泌乳奶牛的采食和反刍行为。结果表明，两种方法在识别采食和反刍时段方面是一致的。两种方法在总采食时间（8.7分钟±12.8）和反刍时间（42.9分钟±12.0）上的平均差异显著。与自动系统相比，通过观察记录的采食和反刍时间分别高出3.6%和10.3%。差异表明观察方法本身存在不准确之处。自动系统可能在进一步研究牛的采食和反刍活动中证明是有用的。
