Concentrations of H2 and CH4 in exhaled breaths and stomachs of dairy cattle with abomasal displacement
2008
Itoh, M.(Hokkaido. Animal Research Center, Shintoku (Japan)) | Kamiyoshi, T. | Sasaki, N. | Yamada, H. | Inokuma, H.
To elucidate gaseous dynamics during abomasal displacement (AD), concentrations of H2 and CH4 in the exhaled breaths and the stomachs of cows with AD (n = 20) were measured and compared with concentrations in cows without AD (n = 10). Concentrations of H2 and CH4 in the rumen did not differ significantly between cows with and without AD, nor did they differ significantly between the rumen and abomasum of cows with AD. However, concentrations of H2 and CH4 in exhaled breath of cows with AD were significantly lower than those of cows without AD (5.2 ppm versus 22.1 ppm H2 and 694.8 ppm versus 6036.0 ppm CH4, respectively). These results suggest that an excessive accumulation of abomasal gas, which is an essential prerequisite for AD, occurred due to the inhibition of eructation and inflow to the abomasum of gas produced in the rumen of cows with AD.
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