Continuous and Long-Term Measurement of Reticuloruminal pH in Grazing Dairy Cows by an Indwelling and Wireless Data Transmitting Unit.
Continuous and Long-Term Measurement of Reticuloruminal pH in Grazing Dairy Cows by an Indwelling and Wireless Data Transmitting Unit.
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DOI：
10.1155/2012/236956
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发表时间：
2012
影响因子：
3.1
通讯作者：
Steinwidder A
中科院分区：
文献类型：
--
作者：
Gasteiner J;Guggenberger T;Häusler J;Steinwidder A
本研究旨在连续测定放牧奶牛的瘤胃pH值，以监测饲粮对瘤胃pH值的影响。对6头经口奶牛进行了一种新型的留置ph测量及数据传输系统。在40 d期间，每600秒测定一次瘤胃pH。在牛舍饲喂转牧场后，测量期内分为连续放牧(G)、连续放牧加4 kg/d干草（GH）和连续放牧加4 kg/d精料（GC） 3个处理（2头/处理）。改饲期间，瘤胃pH由6.58±0.15显著降低至6.19±0.19 （P < 0.05）。G、GH和GC的平均瘤胃pH分别为6.36、6.56和6.01。平均24 h最小pH分别为5.95、6.20和5.58。pH值低于6.3、6.0、5.8和5.5时，G分别为583、91、26和3 min/d， GH分别为97、12、0和0 min/d， GC分别为1126、621、347和101 min/d。结果受到饮食的显著影响。该留置式pH测量及数据传输系统是长期测量奶牛瘤胃pH的一种非常实用和合适的工具。
The aim of the present study was the continuous measurement of ruminal pH in grazing dairy cows to monitor the diets effects on ruminal pH value. A novel indwelling pH-measurement and data transmitting system was given to 6 multiparous cows orally. Ruminal pH was measured every 600 sec over a 40 d period. After barn feeding and changeover to pasture, the following 3 treatments (2 cows/treatment) were included in the measurement period: continuous grazing (G), continuous grazing plus 4 kg/d of hay fed twice daily (GH), and continuous grazing plus 4 kg/d of concentrate (GC). Ruminal pH decreased significantly (P < 0.05) from 6.58 ± 0.15 to pH 6.19 ± 0.19 during feed changeover to pasture. Mean ruminal pH for G, GH, and GC was 6.36, 6.56, and 6.01. Mean 24-h minimum pH was 5.95, 6.20 and, 5.58. The time pH was below 6.3, 6.0, 5.8, and 5.5, for G it was 583, 91, 26, and 3 min/d, for GH it was 97, 12, 0, and 0 min/d and for GC it was 1126, 621, 347, and 101 min/d, respectively. Results were significantly influenced by the diet. The indwelling pH-measurement and data transmitting system is a very useful and proper tool for long-term measurement of ruminal pH in cows.