Intrafollicular Concentrations of Steroid Hormones and PGF_<2α> in Relation to Follicular Development in the Mares during the Breeding Season

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The concentrations of androstenedione, estradiol-17β, progesterone and PGF_<2α> contained in the follicular fluid produced by the follicles in collected ovaries of mares that have had estrous phase during the breeding season were measured and analyzed the relation between the growth stage of follicles and the hormone levels in the follicular fluid. An ultrasonographic diagnostic instrument was used to measure the diameter of the follicles in order to categorize the follicles into three groups the following: 8 small follicles (from 1.0 to less than1.5 cm), 8 medium follicles (from 1.5 to less than 3.0 cm), and 8 large follicles (from 3.0 to 5.0 cm), respectively. The analysis of the follicular fluid in ovaries of estrous mares showed that the concentrations of androstenedione were significantly higher in the medium or large follicles than in the small follicles and the concentrations of estradiol-17β were significantly higher in larger follicles than in the small or medium follicles (P<0.05). The concentrations of progesterone and PGF_<2α>, on the other hand, did not significantly vary regardless of follicluar size. In the follicles within the mare ovaries that have had estrous stage, the concentrations of the hormones related the ovulation, namely androstenedione and estradiol-17β, were higher with larger follicles.

The concentrations of androstenedione, estradiol-17β, progesterone and PGF<sub>2</sub><sub>α</sub> contained in the follicular fluid produced by the follicles in collected ovaries of mares that have had estrous phase during the breeding season were measured and analyzed the relation between the growth stage of follicles and the hormone levels in the follicular fluid. An ultrasonographic diagnostic instrument was used to measure the diameter of the follicles in order to categorize the follicles into three groups the following: 8 small follicles (from 1.0 to less than1.5 cm), 8 medium follicles (from 1.5 to less than 3.0 cm), and 8 large follicles (from 3.0 to 5.0 cm), respectively. The analysis of the follicular fluid in ovaries of estrous mares showed that the concentrations of androstenedione were significantly higher in the medium or large follicles than in the small follicles and the concentrations of estradiol-17β were significantly higher in larger follicles than in the small or medium follicles (P<0.05). The concentrations of progesterone and PGF<sub>2</sub><sub>α</sub>, on the other hand, did not significantly vary regardless of follicluar size. In the follicles within the mare ovaries that have had estrous stage, the concentrations of the hormones related the ovulation, namely androstenedione and estradiol-17β, were higher with larger follicles.<br>

収録刊行物

  • Japanese journal of equine science = 日本ウマ科学会雑誌  

    Japanese journal of equine science = 日本ウマ科学会雑誌 19(2), 31-34, 2008-06-01 

    日本ウマ科学会

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各種コード

  • NII論文ID(NAID)
    10021217491
  • NII書誌ID(NCID)
    AN10383923
  • 本文言語コード
    ENG
  • 資料種別
    NOT
  • ISSN
    09171967
  • NDL 記事登録ID
    9585069
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z18-3142
  • データ提供元
    CJP書誌  NDL  IR  J-STAGE 
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