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Table 2.

Deuterium (2H) enrichment of body water and adipose tissue in male field voles exposed to short and long day photoperiods

Photoperiod
ANOVA
TraitSDLD increaseLD plateauF1P
2H enrichment (p.p.m.)      
   Body water      
      Unlabelled voles2 144.6±0.5 144.7±0.4 144.4±0.4 0.4 0.68 
      Labelled voles      
      Day 73 477.0±24.4 485.7±23.4 474.8±16.6 1.0 0.40 
      Day 143 479.3±13.8 487.6±24.9 479.0±19.5 0.8 0.46 
   Subcutaneous fat4      
      Unlabelled voles2 124.8±1.4 124.3±0.2 124.7±1.1 0.2 0.84 
      Labelled voles 173.0±15.8 174.1±14.9 164.4±15.2 1.6 0.22 
   Epididymal fat4      
      Unlabelled voles2 124.7±0.8 125.0±0.7 124.1±0.7 1.1 0.39 
      Labelled voles 172.9±15.2 174.6±12.8 167.5±16.3 0.8 0.44 
De novo lipogenesis (%)      
   Subcutaneous fat 27.1±8.5 27.4±7.4 22.7±9.3 1.5 0.24 
   Epididymal fat 27.1±8.3 27.3±6.6 24.7±9.9 0.5 0.61 
Photoperiod
ANOVA
TraitSDLD increaseLD plateauF1P
2H enrichment (p.p.m.)      
   Body water      
      Unlabelled voles2 144.6±0.5 144.7±0.4 144.4±0.4 0.4 0.68 
      Labelled voles      
      Day 73 477.0±24.4 485.7±23.4 474.8±16.6 1.0 0.40 
      Day 143 479.3±13.8 487.6±24.9 479.0±19.5 0.8 0.46 
   Subcutaneous fat4      
      Unlabelled voles2 124.8±1.4 124.3±0.2 124.7±1.1 0.2 0.84 
      Labelled voles 173.0±15.8 174.1±14.9 164.4±15.2 1.6 0.22 
   Epididymal fat4      
      Unlabelled voles2 124.7±0.8 125.0±0.7 124.1±0.7 1.1 0.39 
      Labelled voles 172.9±15.2 174.6±12.8 167.5±16.3 0.8 0.44 
De novo lipogenesis (%)      
   Subcutaneous fat 27.1±8.5 27.4±7.4 22.7±9.3 1.5 0.24 
   Epididymal fat 27.1±8.3 27.3±6.6 24.7±9.9 0.5 0.61 

Male field voles were dosed with deuterium for 14 days in short day photoperiod (SD, 8 h:16 h L:D, N=12), long day photoperiod (LD, 16 h:8 h L:D) over days 10–24 (the increase phase, N=14), and long day photoperiod over days 52–66 (the plateau phase, N=13). Contribution of de novo lipogenesis to fatty acids of adipose tissue is also presented. Values are means ± s.d.

1

F2,6 for unlabelled and F2,36 for labelled voles

2

N=3 for each photoperiod group

3

following the beginning of the dosing period

4

measured in fatty acids extracted from the tissue

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