Follicular dynamics during the pre-ovulatory and subsequent first follicular wave stages affect the pregnancy outcome in Japanese Black cows

• YOSHIYAMA Tsumugi

  Graduate School of Veterinary Sciences, Iwate University, Iwate 020-8550, Japan Fukushima Prefecture Agricultural Mutual Aid Association, Fukushima 963-6311, Japan

• KANAZAWA Tomomi

  Cooperative Department of Veterinary Medicine, Iwate University, Iwate 020-8550, Japan

• TAKAHASHI Toru

  Graduate School of Veterinary Sciences, Iwate University, Iwate 020-8550, Japan Cooperative Department of Veterinary Medicine, Iwate University, Iwate 020-8550, Japan

Abstract

The diameters of the pre-ovulatory follicles (PF) and the largest follicle during the subsequent first follicular wave (W1LF), and plasma estradiol-17β (E₂) concentrations were monitored on Days 0, 1, 3, 5, and 7 (ovulation = Day 1). Pregnancy was diagnosed on Day 30. Cows were classified into two groups according to the location of the dominant follicle ipsilateral (IG) or contralateral (CG) to the corpus luteum on Day 7. From Days 3 to 7, some follicles that had been determined as the subordinate in the previous examination exceeded the W1LF located in the opposite ovary in terms of the diameter. These were defined as switching (SW), whereas others were defined as non-switching (NSW). The diameter of PF was significantly smaller in pregnant (P) animals than in non-pregnant (NP) animals. The plasma E₂ concentration on Day 0 was significantly higher in P animals than in NP animals and tended to be higher in NSW than in SW. In addition, plasma E₂ concentrations around Days 3 to 7 tended to be higher in P animals of NSW than in NP animals of SW. The conception rates did not differ between IG and CG but were significantly higher in NSW than in SW. In the IG group, the conception rate tended to be higher in NSW than in SW.

Journal

• Journal of Reproduction and Development

  Journal of Reproduction and Development 67 (6), 345-351, 2021

  The Society for Reproduction and Development

Keywords

• Conception rate
• Cow
• Estradiol-17β
• First-wave dominant follicle
• Switching

Details

• CRID: 1390571859153252608
• NII Article ID: 130008128840
• NII Book ID: AA10936678
• DOI: 10.1262/jrd.2021-024
• ISSN: 13484400
• ISSN: 09168818
• PubMed: 34556611
• Web Site: https://iwate-u.repo.nii.ac.jp/records/15758
• Web Site: https://www.jstage.jst.go.jp/article/jrd/67/6/67_2021-024/_pdf
• Web Site: https://search.jamas.or.jp/link/ui/2023054187
• Text Lang: en
• Data Source:
  • JaLC
  • IRDB
  • Crossref
  • PubMed
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed