Ovarian Follicular Dynamics and Hormonal Changes in Goats during Early Pregnancy

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Author(s)

    • Watanabe Gen WATANABE Gen
    • Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology
    • SOSA Gamal A.
    • Department of Theriogenology, Faculty of Veterinary Medicine, Benha University
    • LI Jun Y.
    • Animal Resource Science Center, Graduate School of Agriculture and Life Science, University of Tokyo
    • MANABE Noboru
    • Animal Resource Science Center, Graduate School of Agriculture and Life Science, University of Tokyo
    • TAYA Kazuyoshi
    • Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology

Abstract

The present study was conducted to characterize follicular development and its hormonal control during early pregnancy in goats. The ovaries of goats (n=8) were scanned daily for follicles (> or = 2 mm in diameter) and corpora lutea by transrectal ultrasound with blood sampling from the jugular vein for monitoring the hormonal changes during the first thirty-five days after mating. During early pregnancy, three (37.5%), four (50%) and one (12.5%) goat showed nine, eight and seven waves of follicular development, respectively. The corpora lutea were detected as early as Day 3.61 ± 0.45 (7.47 ± 0.43 mm) of pregnancy (Day 0=day of mating) and attained their maximal cross-sectional diameter (10.64 ± 0.37 mm) on Day 25.7 ± 0.8 of pregnancy, respectively. A transient rise in FSH levels was temporally associated with the day of follicular wave emergence (up to three days prior to wave emergence). The plasma LH and estradiol levels were negatively correlated with the progesterone concentration. The rise in plasma immunoreactive (ir) inhibin levels was negatively correlated with the FSH concentration and positively correlated with the number of large-sized follicles. Alternatively, the mean plasma ir-inhibin levels showed a noticeable decline with the progression of pregnancy. The present results demonstrated that follicular development during early pregnancy shows a wave-like pattern, with seven to nine waves developing until Day 35 after breeding, and that the number of follicular waves can be predicted by the number of FSH peaks. The current study also demonstrated that the role of inhibin as an FSH regulator is maintained throughout early pregnancy.<br>

Journal

  • Journal of Reproduction and Development

    Journal of Reproduction and Development 56(5), 520-526, 2010-10-01

    THE SOCIETY FOR REPRODUCTION AND DEVELOPMENT

References:  30

Codes

  • NII Article ID (NAID)
    10027571842
  • NII NACSIS-CAT ID (NCID)
    AA10936678
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09168818
  • NDL Article ID
    10867118
  • NDL Source Classification
    ZR22(科学技術--農林水産--畜産)
  • NDL Call No.
    Z54-H305
  • Data Source
    CJP  NDL  J-STAGE 
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