Effects of supplemental oxytocin or prostaglandin F2α analogue in extended boar semen on piglet productivity of gilts and sows artificially inseminated in summer

We determined the effects of oxytocin (OT) and prostaglandin F2α analogue (PG) added to extended boar semen on duration artificial insemination (AI) reproductive performance pigs bred in July August (temperate climate Central Europe). Eighty gilts second parity sows (G+SP) sixty-four multiparous (M) were divided into three groups. Group OT (11 G+SP 37 M) group PG (20 28 artificially inseminated twice (at onset estrus 22–24 h later) using supplemented with 20 IU or 5 mg PG, respectively. Thirty-three 15 M served as controls (C) non-supplemented semen. The mean first AI was shorter (P<0.05) compared females PG-supplemented (80±22 s vs. 191±26 s, respectively), whereas than OT-supplemented (93±15 192±28 s). pregnancy rate lower C (26/33; 85%) (11/11; 100%). had more stillborn piglets per litter their counterparts (0.8±0.1 0.1±0.3). In summary, addition associated times G+SP, but farrowing rates younger animals. Oxytocin supplementation a higher young females, older sows.