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Arithmetic means () and standard deviation (SD) for the concentrations of testosterone (ng/mL) in the peripheral blood of pre-pubertal gilts on different sampling dates and in the experimental groups (group EI 20 μg ZEN/kg BW; group EII 40 μg ZEN/kg BW). Statistically significant differences were determined at * or ^ p ≤ 0.05 and ** p ≤ 0.01; *—EI or EII compared with C; ^—EII compared with EI.
