Preventive effects of CIDR-based protocols on premature ovulation before timed-Al in Ovsynch in cycling beef cows

被引:5
|
作者
Sakase, M.
Kawate, N.
Nakagawa, C. [1 ]
Fukushirna, M.
Noda, M.
Takeda, K.
Ueno, S.
Inaba, T.
Kida, K.
Tarnada, H.
Sawada, T.
机构
[1] Osaka Prefecture Univ, Grad Sch Life & Environm Sci, Dept Adv Pathobiol, Sakai, Osaka 5998531, Japan
[2] No Ctr Agr Technol, Gen Technol Ctr Hyogo Prefecture Agr Forest & Fis, Wadayama, Hyogo 6998524, Japan
来源
VETERINARY JOURNAL | 2007年 / 173卷 / 03期
关键词
CIDR-based protocol; timed-AI; premature ovulation; ovsynch; beef cattle;
D O I
10.1016/j.tvjl.2005.12.012
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Ovsynch is a program developed to synchronize ovulation for timed breeding. In this paper, the authors investigate whether controlled internal drug release (CIDR)-based protocols prevent premature ovulation before timed-artificial insemination (Al) when Ovsynch is started a few days before luteolysis in cycling beef cows. Nine beef cows at 16 days after oestrus were treated with (1) Ovsynch, i.e. gonadotropin releasing hormone (GnRH) analogue on day 0, prostaglandin (PG) F-2 alpha analogue on day 7 and GnRH analogue on day 9 with timed-Al on day 10, (n = 3); (2) Ovsynch + CIDR (Ovsynch protocol plus a CIDR for 7 days from day 0, n = 3), or (3) oestradiol benzoate (013) + CIDR + GnRH (013 on day 0 in lieu of the first GnRH treatment, followed by the Ovsynch + CIDR protocol, n = 3). In the Ovsynch group (1) plasma progesterone concentrations fell below 0.5 ng/mL earlier (day 5) than in both CIDR-treated groups (2) and (3), where this occurred on day 8. Plasma oestradiol-17 beta concentrations peaked on day 8 in the Ovsynch group and on day 9 in both CIDR-treated groups. The dominant follicle ovulated on day 10 in the Ovsynch group and on day 11 in both CIDR-treated groups. Thus, both CIDR-based protocols prevented premature ovulation before timed-Al in Ovsynch when the protocol was started a few days before luteolysis. This reflects the fact that progesterone levels remained high until the beef cattle were treated with PGF(2 alpha). (C) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:691 / 693
页数:3
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