Fixed-time artificial insemination in beef cattle
<p>Abstract</p> <p>Background</p> <p>The study was designed to test the effect of fixed-time artificial insemination (fixed-AI) after the slightly modified Ovsynch protocol on the pregnancy rate in beef cattle in Finnish field conditions. The modification was aimed to o...
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| Format: | Article |
| Language: | English |
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BMC
2009-11-01
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| Series: | Acta Veterinaria Scandinavica |
| Online Access: | http://www.actavetscand.com/content/51/1/48 |
| Summary: | <p>Abstract</p> <p>Background</p> <p>The study was designed to test the effect of fixed-time artificial insemination (fixed-AI) after the slightly modified Ovsynch protocol on the pregnancy rate in beef cattle in Finnish field conditions. The modification was aimed to optimize the number of offsprings per AI dose.</p> <p>Methods</p> <p>Ninety Charolais cows and heifers were entered into the program an average of 1.8 times. Thus, 164 animal cases were included. Animals were administered 10-12 μg of buserelin. Seven days later animals without a corpus luteum (CL) were rejected (20.7%) while the remaining 130 cases with a CL were administered prostaglandin F<sub>2α</sub>, followed 48 h later with a second injection of buserelin (8-10 μg). Fixed-AI was performed 16-20 hours after the last injection.</p> <p>Results</p> <p>The pregnancy rate was 51.5% (67/130). The pregnancy rate after a short interval (50-70 d) from calving to entering the program was significantly higher than that after a long interval (>70 d).</p> <p>Conclusion</p> <p>This protocol seems to give acceptable pregnancy results in beef herds and its effect on saving labour is notable.</p> |
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| ISSN: | 1751-0147 |