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Volume 51, Number 3-4 >

Follicular development after ovum pick-up and fertilizability of retrieved oocytes in postpartum dairy cattle

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Title: Follicular development after ovum pick-up and fertilizability of retrieved oocytes in postpartum dairy cattle
Authors: Sasamoto, Yoshihiko Browse this author
Sakaguchi, Minoru Browse this author
Nagano, Masashi Browse this author →KAKEN DB
Katagiri, Seiji Browse this author
Takahashi, Yoshiyuki Browse this author →KAKEN DB
Keywords: cattle
ovum pick-up
Issue Date: Feb-2004
Publisher: The Graduate School of Veterinary Medicine, Hokkaido University
Journal Title: Japanese Journal of Veterinary Research
Volume: 51
Issue: 3-4
Start Page: 151
End Page: 159
Abstract: This study aimed to evaluate gonadotropin secretion and the developmental competence of follicular oocytes in dairy cattle during the early postpartum (PP) period. The number of follicles developed after transvaginal ultrasound-guided ovum pick-up (OPU) and fertilizability of retrieved oocytes were compared between cows in which the first dominant follicle (DF) ovulated (ovulated group, n=4) and did not ovulate (non-ovulated group, n=3), and between early PP (early PP group, n=2) and after the resumption of the estrous cycle (cyclic group, n=2). Follicular ablation was performed 2-4 days after the detection of DF in the second follicular wave PP. OPU was repeated 3-5 times at 3 or 4- day intervals from 3-4 days after the follicular ablation. At OPU, the follicles were enumerated and all those ≧5mm in diameter were aspirated. Recovered oocytes were subjected to in vitro maturation and fertilization. Both criteria were similar between ovulated and non -ovulated groups, and between early PP and cyclic groups. These results suggest that FSH/LH secretions required for follicle recruitment and subsequent follicular growth during the early PP period are similar to those after resumption of the estrous cycle. They also indicate that follicular oocytes during the early PP period have developmental competence.
Type: bulletin (article)
Appears in Collections:Japanese Journal of Veterinary Research > Volume 51, Number 3-4

Submitter: 獣医学部図書室

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