Table 4. Changes in progesterone and estrogen levels

Parameter (ng mL−1)	After CIDR removal
	0 h	24 h	48 h	72 h	96 h
P4	9.53 ± 2.18	0.580 ± 0.09	0.316 ± 0.08	0.259 ± 0.06	0.255 ± 0.07
E2	18.9 ± 5.19	14.0 ± 2.15	24.2 ± 3.35	24.4 ± 6.93	13.3 ± 2.44

The experiments were completed within seven biological replicates.
Data were presented as mean ± SE.
P4, progesterone; E2, estrogen; CIDR, controlled internal drug releas.