Prostaglandin $F_2{alpha}$ ($PGF_2{alpha}$) can facilitate release of epinephrine from the adrenal gland. The objective was to extend these findings and determine the effects of $PGF_2{alpha}$ on sexual activity and semen collection training in sexually inexperienced boars. Boars (n=32; $281{pm}18$ days of age) were moved individually once weekly to a semen collection room equipped with an artificial sow. Before entering the semen collection room, boar received i.m. treatments of $PGF_2{alpha}$ at doses of 5 (n=8), 10 (n=8), or 20 (n=8), and control boar (n=8) were not treated. Reaction time (elapsed time after entering collection pen until the start of mounting) for boars receiving 5mg ($3.3{pm}0.9;min$), 10mg ($3.3{pm}0.8;min$) $PGF_2{alpha}$ was shorter (p<0.05) than for controls ($6.7{pm}0.9min$). Duration of ejaculation (min) per session was longer (p<0.05) for $PGF_2{alpha}$ (10 mg, 20 mg)-treated boars ($7.3{pm}0.7;min$, $6.9{pm}0.7;min$), compared to control ($3.4{pm}0.8;min$). The number of training session per boars was less (p=0.056) for $PGF_2{alpha}$ 10mg-treated boars ($1.0{pm}0.4$), compared to control ($2.0{pm}0.4$). Semen characteristic such as volume, concentration, the number of total ejaculated sperm, were similar for $PGF_2{alpha}$-treated and controls. There was no apparent difference on sperm movement characteristics (Mot: motility, VCL : curve linear velocity, VSL : straight line velocity, VAP : average path velocity, LIN : linearity) after semen preservation by collected with or without $PGF_2{alpha}$ treatment. In summary, administration of $PGF_2{alpha}$ in boars increased the sexual activity and facilitated the training boars to mount an artificial sow for semen collection, but did not affect semen characteristic.