Table 1.
Animal characteristics
| Variable | Proestrus | Estrus | Diestrus |
|---|---|---|---|
| n | 8 | 8 | 7 |
| Age, mo | 6.0 ± 0.3 | 5.9 ± 0.2 | 5.9 ± 0.2 |
| Body mass, mg | 23.9 ± 1.7 | 24.2 ± 1.7 | 24.4 ± 1.1 |
| Heart mass, mg | 0.11 ± 0.01 | 0.12 ± 0.02 | 0.12 ± 0.01 |
| Percent heart:body mass ratio | 0.47 ± 0.05 | 0.50 ± 0.07 | 0.51 ± 0.03 |
| Spleen mass, mg | 0.09 ± 0.02 | 0.11 ± 0.02 | 0.10 ± 0.01 |
| Percent spleen:body mass ratio | 0.41 ± 0.07 | 0.44 ± 0.06 | 0.42 ± 0.03 |
| WAT mass, mg | 0.76 ± 0.24 | 0.76 ± 0.36 | 0.77 ± 0.19 |
| Percent WAT:body mass ratio | 3.16 ± 0.88 | 3.08 ± 1.37 | 3.14 ± 0.67 |
| Gastroc mass, mg | 0.15 ± 0.02 | 0.18 ± 0.04 | 0.17 ± 0.03 |
| Percent gastroc:body mass ratio | 0.67 ± 0.11 | 0.75 ± 0.15 | 0.70 ± 0.13 |
| Uterus mass, mg | 0.10 ± 0.01 | 0.08 ± 0.01* | 0.08 ± 0.01* |
| Percent uterus:body mass ratio | 0.43 ± 0.04 | 0.33 ± 0.05* | 0.32 ± 0.03* |
| Esterone, ng/mL | 0.002 ± 0.001 | 0.001 ± 0.000* | 0.001 ± 0.001 |
| Estradiol, ng/mL | 0.008 ± 0.001 | 0.001 ± 0.000 | 0.002 ± 0.003 |
| E2:E1 ratio | 2.64 ± 1.74 | 0.49 ± 0.01 | 1.45 ± 0.76 |
| Progesterone, ng/mL | 2.32 ± 1.15 | 5.42 ± 2.80 | 4.40 ± 2.70 |
| Testosterone, ng/mL | 0.016 ± 0.012 | 0.024 ± 0.096 | 0.094 ± 0.050*† |
Values are means ± SD; n, number of animals. WAT, white adipose tissue; gastroc, gastrocnemius; E2, estradiol; E1, esterone. *P < 0.05 vs. proestrus †P < 0.05 vs. estrus.