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)

Table 6 Correlations between melatonin, glucose, insulin, GH, IGF-1 and leptin mean levels during the two 24 h periods and the beginning, end and duration of the previous or following winter ovarian inactivity.

	2^nd ovulatory winter inactivity			3^rd ovulatory winter inactivity
	Beginning	End	Duration	Beginning	End	Duration
Melatonin	-0.37 P < 0.05	NS	NS	NS	NS	NS
Glucose	0.69 P < 0.0001	-0.60 P < 0.01	-0.67 P < 0.0001	0.60 P < 0.001	-0.60 P < 0.001	-0.68 P < 0.0001
Insulin	0.54 P < 0.001	-0.57 P < 0.01	-0.60 P < 0.001	0.45 P < 0.05	-0.61 P < 0.001	-0.62 P < 0.001
GH	-0.82 P < 0.0001	0.62 P < 0.001	0.78 P < 0.0001	-0.71 P < 0.0001	0.59 P < 0.001	0.72 P < 0.0001
IGF-1	NS	NS	NS	NS	NS	NS
Leptin	0.60 P < 0.001	-0.63 P < 0.001	-0.67 P < 0.0001	0.58 P < 0.001	-0.68 P < 0.0001	-0.73 P < 0.0001

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