Figure 4.

The concentration of α-lactalbumin (α-lac) in mammary tissues obtained from parous rats treated with insulin-like growth factor (IGF)-I (P-IGF-I), untreated parous rats (P-Un), and age-matched virgin rats (AMV). The IGF-I treatment (0.66 mg/kg body weight/day) was continued for 7 days before samples were collected. Values are expressed as mean ± standard error. *P < 0.05 versus AMV and P-IGF-I.