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Figure 3 | Reproductive Biology and Endocrinology

Figure 3

From: Effects of nutritional cues on the duration of the winter anovulatory phase and on associated hormone levels in adult female Welsh pony horses (Equus caballus)

Figure 3

Variations in plasma concentrations of melatonin. Melatonin variations are shown over a 24 h period at two different times of year (end of winter and end of spring in WF, R and V groups, means ± S.E.M, one sample each hour). The V group was fed in winter like the WF group and in spring like the R group. The black rectangles indicate the natural night.

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