Figure 2: Effect of leptin treatment on plasma leptin levels (A) and cumulative food intake (B) in broiler chickens: Two homogenous weightmatched groups of 3-wk-old broiler chickens (n = 5) were continuously treated with recombinant chicken leptin (8 µg/kg/h during 6h at a constant rate of 3 mL/h) or saline solution. Food intake was recorded at the end of the treatment and plasma leptin levels were measured by RIA as described in materials and methods. Data are presented as mean ± SEM and * different from the control, P<0.05.