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Fig. 2. The calibration if the 13C-labelled bicarbonate technique in
cockatiels 2030 min after injection. (A) There was no significant
relationship if isotope elimination rate (kc) alone is
used for the comparison with the metabolism
(
O2) measured
simultaneously by indirect calorimetry (regression;
y=10.6x+3.8, r2=0.11,
F1,20=2.35, P=0.14) with a low
r2 of 10.99%. (B) The relationship of oxygen consumption
to the product of elimination rate and bicarbonate pool size was significant
(regression; y=5.12x+0.3, r2=0.72,
F1,20=49.54, P<0.001) with a high
r2 of 72.3%.