Endogenous purine and pyrimidine derivative excretion in pregnant sows
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Date
1995
Authors
Martin-Orúe, S. M.
Balcells Terés, Joaquim
Guada, J. A.
Castrillo, C.
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Abstract
The present experiment was camed out to study the endogenous losses of purine and pyrimidine
derivatives from pregnant sows. Three pregnant and three non-pregnant Large White x Landrace sows
were fed on a purine-free diet composed of starch, glucose, sucrose and vegetable oil, with casein as the
protein source. The experiment began, for the six animals, after diagnosis of pregnancy and was divided
into six 12 d periods. Urine was collected during the Arst 3 d of each experimental period by means of
a urethral catheter for determination of allantoin, uric acid, xanthine, hypoxanthine and pseudouridine
concentrations. In the absence of dietary nucleic acids (NA), allantoin and, as a consequence, excretion
of total purine derivatives (PD) decreased significantly to a constant value (128.3 (SE 7.07) ,umol/kg
metabolic live weight (W"75) per d), an amount assumed to represent endogenous excretion. Excretion
of uric acid (38.7 (SE 2-15) mollkg W0'p7e5r d), hypoxanthine (21.0 (SE 2.58) ymollkg W'75 per d) and
xanthine (11-2 (SE 0.83) pmol/kg W@" per d) were not affected by the experimental treatment, although
there was a significant decrease in hypoxanthine excretion in pregnant sows (from 25.5 to 5.2 pnol/kg
W@75 per d) compared with nowpregnant sows (from 26.7 to 44%/rmol/kg W@75p er d). Creatinine
excretion was not affected by pregnancy and was used as an internal urinary marker. Purine excretion,
either expressed as pmol/kg WoT5 per d or as the ratio PD:creatinine, was not affected by experimental
treatment, although an apparent increase in pseudouridine excretion, a modified unsalvageable catabolite
of RNA-pyrimidine, was found in late pregnancy (3.6 v. 5.2 mo1/100 mol creatinine in non-pregnant sows
compared with pregnant sows at 102 d collection).
Citation
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British Journal of Nutrition,1995, vol. 73, p. 375-385