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Tracheal Tube for the Total Collection of Rumen and Respiratory Gases

Dairy Cattle Research Branch Animal Husbandry Research Division, ARS Agricultural Research Center, Beltsville, Maryland

ABSTRACT

Tracheostomized animals have been used for nutritional and physiological studies periodically since the late Nineteenth Century. To make energy calculations using the respiratory-quotient method, it is necessary to correct carbon dioxide measurements for any carbon dioxide produced from rumen fermentation. For energy calculations using the carbon-nitrogen balance method it is necessary to make a complete collection of methane and carbon dioxide.

The data of Klein (9) suggest that approximately one-third of the methane formed in the intestinal tract was absorbed and exhaled through the lungs when tracheal and chamber collections were compared. Cresswell's (4) study on methane excretion through the lungs, which related methane absorption to oxygen consumption, might indicate that the absorption was less extensive. Preliminary calculations on our own work involving simultaneous comparisons of tracheal collection of expired gas and chamber collection of total gas from cattle support a magnitude of absorption suggested by the data of Klein (9).

³ Recipient of a Deutsche Forschungsgemeinschaft Fellowship and a Fulbright Travel Grant.