Follicular Turnover and Hormonal Association in Postpartum Goats During Early and Late Lactation

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  • KANDIEL Mohamed M.M.
    Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
  • WATANABE Gen
    Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan
  • ABOU-EL-ROOS Mahmoud E. A.
    Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
  • ABDEL-GHAFFAR Alaa E.
    Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
  • SOSA Gamal A.
    Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
  • EL-AZAB Abd El-Salam I.
    Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
  • NAGAOKA Kentaro
    Laboratory of Animal Breeding and Reproduction, University of Tokyo, Tokyo 113-8657, Japan
  • LI Jun Y.
    Animal Resource Science Center, Graduate School of Agriculture and Life Science, University of Tokyo, Ibaraki 319-0206, Japan
  • MANABE Noboru
    Animal Resource Science Center, Graduate School of Agriculture and Life Science, University of Tokyo, Ibaraki 319-0206, Japan
  • TAYA Kazuyoshi
    Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Gifu 501-1193, Japan

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Abstract

To clarify the effect of lactation period on ovarian follicular activity and associated hormonal levels in goats, six goats were monitored daily by ultrasonographic examination with blood sampling during early (Days 5 to 25; Day 0 was the day of kidding) and late (Days 40 to 60) lactation. While the presence of a corpus luteum of pregnancy retarded follicular growth in the ipsilateral ovary until Days 11-13 postpartum, the total follicular number (TFN) and area (TFA) increased during late lactation due to the significant increase in the number of medium- and large-sized follicles and decrease in the number of small follicles. Four goats showed a similar pattern of follicular development during the period studied characterized by the emergence of five and six waves during the early and late lactation, respectively. The largest follicle diameter of the first three waves monitored during early lactation was significantly smaller as compared with the diameter of those existing during late lactation. TFN showed a positive correlation with FSH but showed a negative correlation with immunoreactive (ir-) inhibin and estradiol during the postpartum period. TFA was positively correlated with ir-inhibin, estradiol and PRL and negatively correlated with FSH during the monitored periods. The plasma levels of ir-inhibin and progesterone were significantly higher during late lactation compared with the levels recorded during early lactation. Ir-inhibin levels showed a significant positive correlation with LH and estradiol during early and late lactation but showed a negative correlation with FSH during the whole lactation period. LH was positively correlated with estradiol and PRL during early and late lactation, respectively. These results suggest that the lactation period has a detrimental effect on ovarian activity during the early postpartum period in goats.

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