Fixed-Time Artificial Insemination Protocol after Treatment for Synchronization of Ovulation with a Combination of Prostaglandin F<sub>2α </sub>and Gonadotropins in Pigs

  • NAKATA Tomoko
    Aichi Livestock Industry Division, Sannomaru
  • TAJIMA Yoko
    Nishimikawa Prefectural Agriculture and Fisheries Office
  • NOGUCHI Michiko
    Kagoshima University Joint Faculty of Veterinary Medicine
  • UENOYAMA Yoshihisa
    Nagoya University Graduate School of Bioagricultural Sciences
  • OHKURA Satoshi
    Nagoya University Graduate School of Bioagricultural Sciences
  • MAEDA Kei-Ichiro
    Tokyo University Graduate School of Agricultural and Life Sciences
  • SUZUKI Chie
    National Institute of Animal Health, National Agriculture and Food Research Organization
  • YOSHIOKA Koji
    National Institute of Animal Health, National Agriculture and Food Research Organization

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Other Title
  • プロスタグランジンF<sub>2α</sub>及び性腺刺激ホルモンによる排卵同期化法を用いた豚の定時人工授精
  • プロスタグランジンF₂α及び性腺刺激ホルモンによる排卵同期化法を用いた豚の定時人工授精
  • プロスタグランジン F ₂ aオヨビ セイセン シゲキ ホルモン ニ ヨル ハイラン ドウキカホウ オ モチイタ ブタ ノ テイジ ジンコウ ジュセイ

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Abstract

To establish a fixed-time artificial insemination (AI) protocol in pigs after treatment for synchronization of ovulation with a combination of prostaglandin F (PGF), equine chorionic gonadotropin and human chorionic gonadotropin (hCG), we investigated the reproductive hormone profiles and ovulation in the synchronized sows and determined a satisfactory timing for a single AI to provide sufficient reproductive performance. Plasma progesterone concentrations significantly decreased on the day following PGF treatment. A preovulatory surge of luteinizing hormone was observed in all synchronized sows, peaking at 26.0±1.2 hours after hCG treatment, and ovulation was detected at 44.8±2.3 hours after treatment. When a timed AI was performed once at 24 or 36 hours after hCG treatment, normal blastcysts were collected from all of the synchronized pigs. Moreover, farrowing rate and average litter size did not differ between the synchronized pigs inseminated once at 24 or 36 hours after hCG treatment and cyclic pigs inseminated multiple times during natural estrus.

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