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ID 116673
Author
Yoshimura, Naoaki Tokushima University|Yamaguchi University
Taniguchi, Masayasu Yamaguchi University
Terazono, Tsukasa Yamaguchi University
Ono, Tetsushi Yamaguchi University
Takagi, Mitsuhiro Yamaguchi University
Sato, Yoko Tokai University
Keywords
chorionic gonadotropin
ovulation
queen
ultrasonography
vaginal stimulation
Content Type
Journal Article
Description
Follicular changes throughout the oestrous phase have been poorly documented in queens because of the location and the small size of ovaries. We investigated follicular development in queens treated with a combination of equine chorionic gonadotropin (eCG) and human chorionic gonadotropin (hCG) and evaluated the effects of vaginal stimulation by a tomcat on ovulation induction. A hormonal treatment was administered using a simple crossover design. Four queens were administered 150 IU of eCG (day 1) and 250 IU of hCG on day 5 and 6. Half of the queens were mated with a vasectomised tomcat for 3 days after hCG injection. Ultrasound imaging of the ovaries clamped at a subcutaneous site was performed once a day from day 1 to 7, and on day 13, and the serum concentrations of oestradiol and progesterone were examined on day 1, 5, 7 and 13. The mean number of follicles gradually increased with the eCG treatment and decreased after hCG injection. The ovulation rate of follicles was significantly higher in the vaginal stimulation group (70.0%) than in the control group (42.6%). During the hormonal treatments, the serum concentration of oestradiol and progesterone did not differ between the two groups. Ultrasound imaging of the ovaries clamped at a subcutaneous site showed that eCG and hCG treatment promoted the follicular growth and corpus luteum formation, respectively. The combination of hCG injection with vaginal stimulation by a vasectomised tomcat enhanced the ovulation rate of follicles.
Journal Title
Veterinary Medicine and Science
ISSN
20531095
Publisher
John Wiley & Sons
Volume
7
Issue
5
Start Page
1569
End Page
1574
Published Date
2021-06-16
Rights
This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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DOI (Published Version)
URL ( Publisher's Version )
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language
eng
TextVersion
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departments
Bioscience and Bioindustry