Department of Veterinary Medicine, Iwate University, 3-18-8 Ueda, Morioka 020-8550, Japan.
Vet Res Commun. 2012 Mar;36(1):85-9. doi: 10.1007/s11259-012-9518-x. Epub 2012 Jan 27.
We developed a novel wireless radio transmission pH measurement system to continuously monitor ruminal bottom pH in cows, and compared these measurements to pH values determined by a spot-sample method. The wireless system consists of a pH sensor, data measurement receiver, relay unit, and personal computer with special software. The bullet-shaped sensor can be easily administered orally via a catheter into the rumen, without surgery. The glass electrode, using a temperature compensation system, can detect the rumen fluid pH with high accuracy. The ruminal bottom pH in healthy rumen-fistulated cows was measured as 6.52 ± 0.18 by the wireless system and as 6.62 ± 0.20 by the spot-sample method; with a correlation between pH measurements using these different methods (n = 8, 24 samples, r = 0.952, P < 0.01). When measured serially in a cow fed a diet evoking rumen acidosis, the ruminal bottom pH decreased markedly following the morning feeding and then increased gradually by the next morning feeding. This wireless system is a ready-to-use tool for estimating circadian changes in ruminal bottom pH.
我们开发了一种新型的无线射频传输 pH 值测量系统，用于连续监测奶牛瘤胃底部 pH 值，并将这些测量值与通过点样法确定的 pH 值进行比较。该无线系统由 pH 传感器、数据测量接收器、中继单元和带有特殊软件的个人计算机组成。子弹形传感器可通过导管经口轻松施用于瘤胃，无需手术。玻璃电极采用温度补偿系统，可高度准确地检测瘤胃液 pH 值。通过无线系统测量健康瘤胃瘘管奶牛的瘤胃底部 pH 值为 6.52 ± 0.18，通过点样法测量的 pH 值为 6.62 ± 0.20；两种不同方法的 pH 值测量值之间存在相关性（n = 8，24 个样本，r = 0.952，P < 0.01）。在给奶牛喂食引发瘤胃酸中毒的日粮时连续测量，瘤胃底部 pH 值在清晨进食后显著下降，然后在下一次清晨进食时逐渐升高。该无线系统是一种用于估计瘤胃底部 pH 值昼夜变化的即用型工具。
