NORMAL HORMONAL RANGES IN THE PREGNANT MARE:

DAYS	PROGESTAGENS (ng/mL)	TOTAL ESTROGENS (pg/mL)	TOTAL T4 (ng/mL)
0 days post-ovulation	<1.0	2.0-50.0	12.0-25.0
2 days post-ovulation	1.0-3.0	2.0-50.0	12.0-25.0
5-90	4.0-10.0	2.0-50.0	12.0-25.0
100-110	4.0-10.0	50.0-300.0	12.0-25.0
110-120	4.0-10.0	150.0-500.0	9.0-25.0
120-130	4.0-10.0	300.0-750.0	9.0-25.0
130-140	4.0-10.0	600.0-950.0	9.0-25.0
140-150	4.0-10.0	800.0-1000.0	9.0-25.0
150-320	4.0-10.0	>1000.0	7.0-25.0
320-325	4.0-15.0	800.0-1000.0	7.0-25.0
326-330	6.0-20.0	600.0-800.0	7.0-25.0
331-335	10.0-30.0	400.0-600.0	7.0-25.0
336-340	20.0-40.0+	200.0-400.0	7.0-25.0
340+	30.0-40.0+	<200.00	7.0-25.0
post foaling	<20.0	2.0-50.0	12.0-25.0

Normal Total Estrogens in donkeys are approximately 20% lower than Normal Total Estrogens in horses.