Results of the DLW measurements of energy expenditure and water turnover in lactating (N=24) and non-reproductive (N=17)female mice and pups (N=43) at 30°C
. | Females . | . | . | |
|---|---|---|---|---|
| Trait . | Lactating . | Non-reproductive . | Pups . | |
| BM (g)a | 37.2±2.7 | 32.2±3.1 | 5.6±0.7 | |
| kd(h—1)b | 0.032±0.006 | 0.009±0.001 | 0.010±0.002 | |
| ko(h—1)c | 0.040±0.006 | 0.015±0.002 | — | |
| ko/kd | 1.260±0.053 | 1.752±0.091 | — | |
| Nd (% of BM)d | 77.7±3.6 | 69.2±3.0 | 76.7±2.4 | |
| No (% of BM)d | 74.0±4.0 | 65.6±3.3 | — | |
| TBW (% of BM)e | 73.4±1.1f | 63.4±3.2g | 71.4±1.8h | |
| Nd/No | 1.050±0.022 | 1.055±0.022 | — | |
| DEE (kJ day—1)i | 70.4±16.2 | 45.1±5.7 | — | |
| rH2O (g day—1)j | 22.63±4.82 | 5.32±1.24k | 1.09±0.25 | |
. | Females . | . | . | |
|---|---|---|---|---|
| Trait . | Lactating . | Non-reproductive . | Pups . | |
| BM (g)a | 37.2±2.7 | 32.2±3.1 | 5.6±0.7 | |
| kd(h—1)b | 0.032±0.006 | 0.009±0.001 | 0.010±0.002 | |
| ko(h—1)c | 0.040±0.006 | 0.015±0.002 | — | |
| ko/kd | 1.260±0.053 | 1.752±0.091 | — | |
| Nd (% of BM)d | 77.7±3.6 | 69.2±3.0 | 76.7±2.4 | |
| No (% of BM)d | 74.0±4.0 | 65.6±3.3 | — | |
| TBW (% of BM)e | 73.4±1.1f | 63.4±3.2g | 71.4±1.8h | |
| Nd/No | 1.050±0.022 | 1.055±0.022 | — | |
| DEE (kJ day—1)i | 70.4±16.2 | 45.1±5.7 | — | |
| rH2O (g day—1)j | 22.63±4.82 | 5.32±1.24k | 1.09±0.25 | |
Values are means ± S.D.
Lactating females and pups were injected with doubly labelled water (DLW)on day 14 of lactation; non-reproductive females were measured on the same days as lactating mice.
Body mass before injection
deuterium elimination rate
18O elimination rate
deuterium (Nd) and 18O(No) dilution spaces (moles) were converted to g assuming a molecular mass of body water of 18.02 and were expressed as % of body mass before injection
total body water measured by desiccation from separated groups of mice,from which no other measurements were taken
data for eight mice (Król and Speakman, 1999)
data for nine mice (Król and Speakman, 1999)
data for 46 pups (present study)
daily energy expenditure
total water turnover
data for 24 mice (17 mice for which DEE was measured and seven mice for which only the 2H enrichments were analysed)