Journal article
Sire effect on the pregnancy outcome in beef cows synchronized with progesterone based Ovsynch and CO-Synch protocols
Animal reproduction science, Vol.104(1), pp.1-8
2008
Handle:
https://hdl.handle.net/2376/108664
PMID: 17270369
Abstract
The objective was to determine the sire effect on the pregnancy outcome in beef cows in which stage of estrus was synchronized with progesterone based fixed-time artificial insemination (AI) protocols. Three Angus sires with more than 300 breedings were evaluated for differences in pregnancy outcome from 1868 inseminations. Angus cross beef cows (
N
=
1868) were synchronized with Ovsynch-CIDR or CO-Synch-CIDR protocols for fixed-time AI. Cows in both groups that showed estrus on day 9 before 1500
h were designated to Selectsynch-CIDR group and were inseminated according to AM-PM rule. Results indicated that Sire 2 had lower fixed-time AI pregnancy rate compared to Sire 3 (48.1% versus 58.7%;
P
=
0.01). Significant sire
×
synchronization program and sire
×
location interactions were observed for fixed-time AI (
P
<
0.05). Sire 2 had a lesser fixed-time AI pregnancy in both Ovsynch-CIDR and CO-Synch-CIDR groups compared to Sire 3. In two of four locations, Sire 2 had a lesser fixed-time pregnancy rate compared to Sire 3. No sire differences were observed in AI pregnancy for cows in Selectsynch-CIDR group. In conclusion, evidence in this study suggest that there are differences in sire fertility when they were used in fixed-time AI protocols, possibly due to the sire differences in sperm capacitation process. Further studies are needed to investigate association of the sire differences in fixed-time AI protocols with sire differences in the sperm capacitation process.
Metrics
5 Record Views
Details
- Title
- Sire effect on the pregnancy outcome in beef cows synchronized with progesterone based Ovsynch and CO-Synch protocols
- Creators
- R Kasimanickam - Department of Large Animal Clinical Sciences, Virginia-Maryland Regional College of Veterinary Medicine, Duckpond Drive, Phase III, Blacksburg, VA 24061, USAJ.B Hall - Department of Animal and Poultry Sciences, College of Agricultural and Life Science, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USAJ.F Currin - Department of Large Animal Clinical Sciences, Virginia-Maryland Regional College of Veterinary Medicine, Duckpond Drive, Phase III, Blacksburg, VA 24061, USAW.D Whittier - Department of Large Animal Clinical Sciences, Virginia-Maryland Regional College of Veterinary Medicine, Duckpond Drive, Phase III, Blacksburg, VA 24061, USA
- Publication Details
- Animal reproduction science, Vol.104(1), pp.1-8
- Academic Unit
- Veterinary Clinical Sciences, Department of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547297701842
- Language
- English
- Resource Type
- Journal article