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Altering systemic acid-base balance through nutrition failed to change secondary sex ratio

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Roche, JR and Lee, JM (2007) Altering systemic acid-base balance through nutrition failed to change secondary sex ratio. Reproduction, Fertility and Development, 19 (8). pp. 887-890. ISSN 1031-3613

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Abstract

There is evidence that differences in either maternal blood pH or dietary mineral content can result in alterations
in secondary sex ratio in mammals. Altering the proportions of certain dietary minerals is known to influence blood pH,
offering a possible explanation for this effect of diet on secondary sex ratio. The present study was performed to investigate
whether altering blood pH by manipulating the dietary cation–anion difference (DCAD) would alter secondary sex ratio.
The DCAD is calculated (in mEq per 100 g dry matter) as the difference between metabolically strong cations (Na+K)
and metabolically strong anions (Cl+S) in the diet. Three hundred female mice were randomly allocated to either a low
or high DCAD ration for 3 weeks before coitus. Urine pH was monitored before beginning the experiment, as well as
before and after the breeding period, as a proxy for blood pH. Mice on the low DCAD diet had a lower urine pH (mean
(±s.d.) 6.0±0.1) than mice on the high DCAD diet (8.2±0.6), but DCAD did not affect the percentage of mice that
became pregnant, the number of offspring per pregnant mouse or the sex ratio of the neonate group. These results suggest
that blood pH alone does not alter sex ratio and that an altered systemic pH is not the reason for reported mineral-related
variations in sex ratio.

Item Type: Article
Keywords: blood pH, dietary cation–anion difference, minerals, urine pH.
Journal or Publication Title: Reproduction, Fertility and Development
Publisher: CSIRO
Page Range: pp. 887-890
ISSN: 1031-3613
Identification Number - DOI: 10.1071/RD06053
Additional Information:

© CSIRO 2007

Date Deposited: 07 Apr 2008 14:12
Last Modified: 18 Nov 2014 03:33
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