Article (Scientific journals)
Effect of ovulation rate and timing of ovulation after different hormone treatments on pregnancy rate in dairy cows
Répási, A.; Szelényi, Z.; Melo de Sousa, Noelita et al.
2019In Polish Journal of Veterinary Sciences, 22 (2), p. 355-362
Peer Reviewed verified by ORBi
 

Files


Full Text
21.pdf
Publisher postprint (215.4 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Dairy cow; GnRH; Progesterone; Prostaglandin; Ultrasonography; Animals; Cattle; Cloprostenol; Female; Gonadotropin-Releasing Hormone; Insemination, Artificial; Ovulation; Pregnancy; Pregnancy Rate
Abstract :
[en] Primiparous and multiparous lactating crossbred dairy cows with a mature corpus luteum and a follicle with >10 mm in diameter were treated with cloprostenol. Those cows that showed oestrus within 5 days after treatment were inseminated (Group P). The other cows (Group PG) were treated with GnRH 2 days after cloprostenol treatment and timed artificial insemination (AI) was performed on the consecutive day, or were inseminated (Group G) after detected oestrus and treated with GnRH immediately after AI. The control cows (Group C) after detected oestrus were only inseminated. All of the AIs using frozen semen were done between 6 and 7 a.m. while the ultrasonographic examinations after AI were performed between 4 to 6 p.m. The ovaries of each cow were scanned by means of transrectal ultrasonography from the day of AI until ovulation. Daily blood samples were collected for progesterone measurements. The ovulation and pregnancy rates among the groups changed between 84.6% and 95.5%, as well as 44.4% and 60%, respectively, however the differences were not statistically significant. All the cows were evaluated according to date of ovulation after AI and the pregnancy rate was 55.4% (Group 1: ovulation occurred between AI and 9-11 h after AI), 54.5% (Group 2: ovulation occurred between 9-11 h and 33-35 h after AI) and 35.5% (Group 3: ovulation occurred between 33-35 h and 57-59 h after AI), respectively. There was a trend (P=0.087) for 2.2 greater odds of staying open among cows inseminated between 33 to 35 h and 57 to 59 h before ovulation compared to cows inseminated within 9 to 11 h before ovulation. If ovulation occurred before AI, the pregnancy rate was only 22.2%, therefore determination of optimal time for AI is of great importance. © 2019 Polish Academy of Sciences. All rights reserved.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Répási, A.;  Kenézlo Dózsa Agricultural Ltd, Kenézlo, H-3955, Hungary
Szelényi, Z.;  Department and Clinic for Production Animals, University of Veterinary Medicine, Üllo, H-2225, Hungary, MTA-SZIE Large Animal Clinical Research Group, Üllo, H-2225, Hungary
Melo de Sousa, Noelita ;  Université de Liège - ULg
Beckers, Jean-François  ;  Université de Liège - ULiège > Département des sciences fonctionnelles (DSF) > Département des sciences fonctionnelles (DSF)
Nagy, K.;  Department and Clinic for Production Animals, University of Veterinary Medicine, Üllo, H-2225, Hungary
Szenci, O.;  Department and Clinic for Production Animals, University of Veterinary Medicine, Üllo, H-2225, Hungary, MTA-SZIE Large Animal Clinical Research Group, Üllo, H-2225, Hungary
Language :
English
Title :
Effect of ovulation rate and timing of ovulation after different hormone treatments on pregnancy rate in dairy cows
Publication date :
2019
Journal title :
Polish Journal of Veterinary Sciences
ISSN :
1505-1773
Publisher :
HARD Pub. Co., Poland
Volume :
22
Issue :
2
Pages :
355-362
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 12 September 2020

Statistics


Number of views
67 (3 by ULiège)
Number of downloads
4 (3 by ULiège)

Scopus citations®
 
0
Scopus citations®
without self-citations
0
OpenCitations
 
0

Bibliography


Similar publications



Contact ORBi