Table 2. Estrous cycle

Group	Dose (mg/kg/day)	No. of estrous cycles1) during 14 days				Estrous cycle length (day)
			1	2	3
G1	0	Mean	3.9	4.1	4.0	4.0
		S.D.	0.3	0.3	0.0	0.2
		N	12	12	7	12
G2	12.5	Mean	4.0	4.1	4.0	4.0
		S.D.	0.0	0.3	0.0	0.1
		N	12	12	7	12
G3	50	Mean	4.0	4.0	4.0	4.0
		S.D.	0.0	0.0	0.0	0.0
		N	12	12	2	12
G4	200	Mean	4.3	4.3	4.0	4.3
		S.D.	0.5	0.6	0.0	0.3
		N	12	12	3	12

One estrous cycle is defined as the distance between the day of estrus and the day before the next estrus.
N, number of animals.