Preovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR? in trypanotolerant female Bos taurus N’Dama cattle
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- 作者：M’foumou W’otari Marcel Okouyi…
- 关键词：N’Dama cow ; Follicular growth ; Ovulation ; CIDR ; eCG
- 刊名：Tropical Animal Health and Production
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：47
- 期：8
- 页码：1443-1448
- 全文大小：333 KB
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Okouyi, M.W.M., Nguyen, K.C. and Hanzen, C., 2014. Effects of - 作者单位：M’foumou W’otari Marcel Okouyi (1)
Pierre-Vincent Drion (2)
Christian Hanzen (1)
1. Faculty of Veterinary Medicine, Theriogenology of Animal Production Department, University of Liège, Avenue de Cureghem, 7d, 4000, Liège, Belgium
2. Faculty of Medicine, University of Liège, CHU—Tour de Pathologie—B 23 Sart Tilman, 4000, Liège, Belgium - 刊物类别：Medicine
- 刊物主题：Medicine & Public Health
Veterinary medicine
Zoology - 出版者：Springer Netherlands
- ISSN：1573-7438
文摘
The aim of this study was to assess the dose (300 to 600 IU) effects of equine chorionic gonadotropin (eCG) on the preovulatory follicle diameter, growth rate and time of ovulation characterized by echography. The eCG was injected at the end (D0) of the 7-day treatment with a controlled internal device release (CIDR?) and a PGF2α being injected 2 days before the removal of the CIDR? (d?). The 120 N’Dama female were distributed into five experimental groups. The control group (n--6) was treated with physiological saline at the removal of the CIDR?, while the animals in the four treated groups received, respectively, 300 IU (n--5), 400 IU (n--4), 500 IU (n--2) and 600 IU (n--3) of eCG. The diameter of the preovulatory follicle was significantly higher (P-lt;-.05) in the animals treated with 300 IU (10.1?±-.4 mm) than in untreated animals (9.3?±-.2 mm). Follicle growth rate was significantly (P-lt;-.05) higher in treated animals (1.0?±-.4 mm/day) than in the control group (0.9?±-.4 mm/day). The average interval between the time of eCG injection and ovulation was similar in the non-treated (83.7?±-4.4 h) and treated animals (79.7?±-1.9). Treated animals showed a significant increase in the percentage of ovulation (94.7 % compared to 73.1 %) (P-lt;-.01). Use of eCG contributed towards synchronising the time of ovulation between 72 to 96 h, which would facilitate the use of systematic insemination. Keywords N’Dama cow Follicular growth Ovulation CIDR eCG