INS and polycystic ovary syndrome: In contrast, duration of the luteal phase was not altered (p ≤ 0.8) by insulin treatment (diluent: control females, 16.0 ± 0.3 days; PCOS-like, 14.1 ± 1.3 days; insulin: control, 15.4 ± 1.0 days, PCOS-like females, 14.4 ± 0.5 days, control vs. PCOS-like: p ≤ 0.2).