Table 1. The serum PRL levels of females was different in different periods.

Item	Periods
	Follicular phase	Luteal phase	Pregnancy (1–3 months)	Pregnancy (4–6 months)	Pregnancy (7–9 months)
PRL (ng/mL)	17.30 ± 2.31	21.18 ± 3.29	47 ± 9.1	104 ± 2.2	348 ± 33.3