Relations between Plasma IGF-I Concentrations during Treatment with CIDR-based or Ovsynch Protocol for Timed AI and Conception in Early Postpartum Japanese Black Beef Cows

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  • KAWATE Noritoshi
    Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University
  • 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, Forestry and Fishery
  • SEO Yasutaka
    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, Forestry and Fishery
  • NODA Masanobu
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forestry and Fishery
  • TAKEDA Kazushi
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forestry and Fishery
  • UENO Satoru
    Northern Center of Agricultural Technology, General Technological Center of Hyogo Prefecture for Agriculture, Forestry 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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Other Title
  • 分娩後早期黒毛和種牛におけるCIDR併用もしくはOvsynch定時人工授精法の処置中における血漿中IGF-I濃度と受胎との関係
  • Relations between Plasma IGF-1 Concentrations during Treatment with CIDR-based or Ovsynch Protocol for Timed AI and Conception in Early Postpartum Japanese Black Beef Cows

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We examined the relations between plasma insulin-like growth factor (IGF) -I concentrations during treatment with CIDR-based or Ovsynch protocol for timed AI and conception and plasma steroid concentrations in early postpartum Japanese Black beef cows. Cows in the control group (Ovsynch; n=21) underwent Ovsynch protocol (GnRH analogue on Day 0, PGF2α analogue on Day 7, and GnRH analogue on Day 9), with AI on Day 10, approximately 20 h after the second GnRH treatment. Cows in the Ovsynch+CIDR group (n=22) received Ovsynch protocol plus a CIDR for 7 days (starting on Day 0). Cows in the further treatment group (EB+CIDR+GnRH; n=22) received 2 mg of estradiol benzoate (EB) on Day 0 in lieu of the first GnRH treatment, followed by the same treatment as in the Ovsynch+CIDR protocol. Plasma IGF-I concentrations were determined on Days -7, 0, 7, 9 and 17. Conception rates were improved in the CIDR-combined groups (both CIDR-treated groups were combined) relative to Ovsynch group (P<0.05) for cows with low IGF-I concentrations (<1,000 ng/ml) on Days -7, 0, and 7, but improved conception rate produced by the CIDR-based protocols did not occur in cows with a high IGF-I concentration (≥1,000 ng/ml). Plasma estradiol-17β concentrations increased from Day 0 to 7 (P<0.05) and were unchanged from Day 7 to 9 in the Ovsynch group with low IGF-I concentrations on Day 0, while they were unchanged from Day 0 to 7 and increased from Day 7 to 9 (P<0.05) in the Ovsynch group with high IGF-I concentrations on Day 0 and in the CIDR-combined group. Plasma progesterone concentrations in the Ovsynch group with low IGF-I concentrations on Day 0 were higher on Day 14 than in the Ovsynch group with high IGF-I concentrations on Day 0 and in the CIDR-combined group (P<0.05). In conclusion, CIDR-based protocols may improve conception relative to Ovsynch in early postpartum beef cows with lower plasma IGF-I concentrations at the start of the protocols. This improvement is probably due to prevention of premature increases of estradiol-17β and progesterone concentrations, which occurred in cows with low IGF-I concentrations treated with Ovsynch, by the CIDR treatment.<br>

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