Diagnosis of subacute ruminal acidosis (SARA) by continuous reticular pH measurements in cows
Diagnosis of subacute ruminal acidosis (SARA) by continuous reticular pH measurements in cows
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DOI：
10.1007/s11259-012-9528-8
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发表时间：
2012-09-01
影响因子：
2.2
通讯作者：
Mizuguchi, Hitoshi
中科院分区：
文献类型：
--
作者：
Sato, Shigeru;Ikeda, Aya;Mizuguchi, Hitoshi
本研究的目的是用饲喂对照日粮的健康奶牛和饲喂诱导瘤胃酸中毒日粮的亚急性瘤胃酸中毒奶牛，通过连续测定瘤胃pH与瘤胃pH的比较，来确定是否可以诊断亚急性瘤胃酸中毒(SARA)。用无线透射式pH测量系统同时测量瘤胃和网状结构的pH值。在健康奶牛和SARA奶牛中，从早晨饲喂到下一次饲喂时间间隔1小时的平均网状pH逐渐下降，但与网状pH相比，瘤胃pH的下降幅度更大。诊断SARA的阈值为网状液1小时平均pH为6.3，网状液和瘤胃pH呈显著正相关。在SARA奶牛的网状液和瘤胃液中，乳酸、氨氮和挥发性脂肪酸的浓度没有差异。这些结果表明，网状pH可用于检测奶牛SARA，而不是使用瘤胃pH。
The objective of this study was to determine whether subacute ruminal acidosis (SARA) could be diagnosed by continuous measurements of the reticular pH, as compared with the ruminal pH, using healthy cows fed a control diet and SARA cows fed a rumen acidosis-inducing diet. The reticular and ruminal pH were measured simultaneously by a radio transmission pH measurement system. The mean reticular pH at 1-h intervals decreased gradually from the morning feeding to the next feeding time in both healthy and SARA cows, though the decrease in the ruminal pH was observed to be more drastic as compared with that observed in the reticular pH. The threshold of the 1-h mean pH in the reticulum for a diagnosis of SARA was considered to be 6.3, and a significant positive correlation was observed between the reticular and ruminal pH. No differences in the concentrations of lactic acid, ammonia nitrogen, and volatile fatty acids were noted between the reticular and ruminal fluids in SARA cows. These results demonstrate that the reticular pH can be used to detect SARA in cows, as opposed to using the ruminal pH.