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To measure eructated gas, a mask was put on the animal's muzzle and a cannula inserted at the anterior end of the transected trachea. A tube connected the mask and cannula to a spirometer. The gas escaped via the trachea. The values obtained with the eructation technique agreed closely with those obtained by aspirating the gas directly from the rumen, Editor.
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Colvin et al. (1957) studied this question.
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