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Kansas Agricultural Experiment Station Research Reports
2000; Kansas Agricultural Experiment Station contribution; no. 00-287-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 850; Beef; AI; Estrus synchronization; Timed AI; GnRH; MGA; Heifers
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Full-Text Articles in Life Sciences
Use Of Gnrh To Increase The Precision Of Estrus And Augment Timed Insemination In Heifers Treated With Melengesterol Acetate And Pgf2, B. Broweleit, J.E. Huston, D.E. Grum, M.L. Day, Sandra K. Johnson
Use Of Gnrh To Increase The Precision Of Estrus And Augment Timed Insemination In Heifers Treated With Melengesterol Acetate And Pgf2, B. Broweleit, J.E. Huston, D.E. Grum, M.L. Day, Sandra K. Johnson
Kansas Agricultural Experiment Station Research Reports
We examined the potential of adding gonadotropin-releasing hormone (GnRH) to a synchrony system based on melengestrol acetate-prostaglandin F2a (MGA-PGF2a) to increase the precision of synchronized estrus and augment timed artificial insemination (AI). Yearling heifers were fed MGA daily for 14 days. Nineteen days after the last feeding of MGA, all heifers were given PGF2a (day 0). Heifers receiving no further treatment served as the untreated controls. In the second treatment, heifers also received an injection of GnRH on day –7. Both groups of heifers were artificially inseminated 12 hours after detected estrus. Heifers in the third treatment received GnRH on …