Inhibitory Effects of CIDR-based Ovulation-synchronization Protocols on Uterine PGF2.ALPHA. Secretion at the Following Luteal Phase in Early Postpartum Non-cycling Beef Cows

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  • SAKASE Mitsuhiro
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forest and Fishery
  • KAWATE Noritoshi
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • NAKAGAWA Chikara
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • FUKUSHIMA Moriyuki
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forest and Fishery
  • NODA Masanobu
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forest and Fishery
  • TAKEDA Kazushi
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forest and Fishery
  • UENO Satoru
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forest and Fishery
  • INABA Toshio
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • KIDA Kayoko
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • TAMADA Hiromichi
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • SAWADA Tsutomu
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University

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  • Inhibitory Effects of CIDR-based Ovulation-synchronization Protocols on Uterine PGF2α Secretion at the Following Luteal phase in Early Postpartum Non-cycling Beef Cows
  • Inhibitory Effects of CIDR based Ovulation synchronization Protocols on Uterine PGF2 アルファ Secretion at the Following Luteal phase in Early Postpartum Non cycling Beef Cows

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We investigated whether CIDR-based ovulation-synchronization protocols inhibit secretion of prostaglandin (PG) F2α from the uterus in the following luteal phase in non-cycling beef cows. Ten early (a month) postpartum non-cycling Japanese Black beef cows were treated with (1) Ovsynch (GnRH analogue on Day 0, PGF2α analogue on Day 7, and GnRH analogue on Day 9; n=3), (2) Ovsynch+CIDR (Ovsynch protocol plus a CIDR for 7 days from Day 0; n=4), or (3) estradiol benzoate (EB) Ovsynch+CIDR (EB on Day 0 in lieu of the first GnRH treatment followed by the Ovsynch+CIDR protocol; n=3). An oxytocin challenge was administered on Day 24 to examine uterine PGF2α secretion. Plasma concentrations of 13,14-dihydro-15-keto- PGF2α were lower at 30-120 min after oxytocin administration in the Ovsynch+CIDR group and 75 min after administration in the EB Ovsynch+CIDR group than in the Ovsynch group (P<0.05). Plasma progesterone concentrations were higher from Days 1 to 7 in the Ovsynch+CIDR group and from Days 1 to 5 in the EB Ovsynch+CIDR group than in the Ovsynch group (P<0.05). The progesterone concentrations were higher on Days 27 and 29 in both CIDR-treated groups than in the Ovsynch group (P<0.05). In conclusion, in non-cycling beef cows, CIDR-based ovulation-synchronization protocols inhibit uterine PGF22α secretion in the following luteal phase and prevent premature luteolysis as is seen with the Ovsynch protocol.<br>

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