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The respiratory quotient in relation to fat deposition in fattening–growing pigs

Published online by Cambridge University Press:  09 March 2007

Kirsten Jakobsen  and
Grete Thorbekt
Kirsten Jakobsen
Affiliation:
National Institute of Animal Science, Department of Animal Physiology and Biochemistry, Foulum, PO Box 39, DK-8830 Tjele, Denmark
Grete Thorbekt
Affiliation:
National Institute of Animal Science, Department of Animal Physiology and Biochemistry, Foulum, PO Box 39, DK-8830 Tjele, Denmark
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Abstract

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The relationship between non-protein respiratory quotient (RQnp) and total fat retention (RFAT) or fat retained from synthesized carbohydrates (RFAT(CHO)) was evaluated from experiments with fattening–growing pigs in the live weight (LW) range from 45 to 120 kg. A commercial feed compound (31 g fat/kg) was fed at low (LI) or high (HI) feed intake in Expt 1, while a semi-purified diet (9.5 g fat/kg) was given without (LO) or with (HO) supplement of 90 g soya-bean oil/kg in Expt 2. RQnp was calculated from 24 h measurements of the gas exchange, RFAT from 7 d N and C balances and RFAT(CHO) from differences between RFAT and digested fat. The measurements showed that about 85 % of the total gas exchange was caused by oxidation of non-protein nutrients and the RQnp varied from 1.00 to 1.34. In Expt 1 RFAT increased with LW from 46 to 141 and from 199 to 335 g/d on LI and HI respectively, whilst in Expt 2 RFAT increased from 191 to 377 and from 267 to 511 g/d on LO and HO respectively. A pronounced linearity was found between RQnp and RFAT for all diets, but the curve for Expt 2 on HO had a lower position than the common curve for the other diets. By relating RQnp to RFAT(CHO) a common linear curve and regression equation could be established in spite of the great variation in dietary composition, intake of fat and fat deposition.

Keywords

24 h gas exchangeRespiratory quotientFat retentionLipogenesisPigs
Type
Metabolic Effects of Growth
Information
British Journal of Nutrition , Volume 69 , Issue 2 , March 1993 , pp. 333 - 343
Copyright
Copyright © The Nutrition Society 1993

References

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